Remove extraneous 'extern' hints

Author: thinkyhead

Marlin/src/feature/fanmux.h

@@ -25,5 +25,5 @@
  * feature/fanmux.h - Cooling Fan Multiplexer support functions
  */
 
-extern void fanmux_switch(const uint8_t e);
-extern void fanmux_init();
+void fanmux_switch(const uint8_t e);
+void fanmux_init();

Marlin/src/lcd/extui/lib/dgus/DGUSDisplay.h

@@ -117,7 +117,7 @@ extern DGUSDisplay dgusdisplay;
 constexpr float cpow(const float x, const int y) { return y == 0 ? 1.0 : x * cpow(x, y - 1); }
 
 /// Find the flash address of a DGUS_VP_Variable for the VP.
-extern const DGUS_VP_Variable* DGUSLCD_FindVPVar(const uint16_t vp);
+const DGUS_VP_Variable* DGUSLCD_FindVPVar(const uint16_t vp);
 
 /// Helper to populate a DGUS_VP_Variable for a given VP. Return false if not found.
-extern bool populate_VPVar(const uint16_t VP, DGUS_VP_Variable * const ramcopy);
+bool populate_VPVar(const uint16_t VP, DGUS_VP_Variable * const ramcopy);

Marlin/src/lcd/extui/lib/mks_ui/draw_about.h

@@ -25,8 +25,8 @@
   extern "C" { /* C-declarations for C++ */
 #endif
 
-extern void lv_draw_about();
-extern void lv_clear_about();
+void lv_draw_about();
+void lv_clear_about();
 
 #ifdef __cplusplus
   } /* C-declarations for C++ */

Marlin/src/lcd/extui/lib/mks_ui/draw_acceleration_settings.h

@@ -25,8 +25,8 @@
   extern "C" { /* C-declarations for C++ */
 #endif
 
-extern void lv_draw_acceleration_settings();
-extern void lv_clear_acceleration_settings();
+void lv_draw_acceleration_settings();
+void lv_clear_acceleration_settings();
 
 #ifdef __cplusplus
   } /* C-declarations for C++ */

Marlin/src/lcd/extui/lib/mks_ui/draw_advance_settings.h

@@ -25,8 +25,8 @@
   extern "C" { /* C-declarations for C++ */
 #endif
 
-extern void lv_draw_advance_settings();
-extern void lv_clear_advance_settings();
+void lv_draw_advance_settings();
+void lv_clear_advance_settings();
 
 #ifdef __cplusplus
   } /* C-declarations for C++ */

Marlin/src/lcd/extui/lib/mks_ui/draw_auto_level_offset_settings.h

@@ -25,8 +25,8 @@
   extern "C" { /* C-declarations for C++ */
 #endif
 
-extern void lv_draw_auto_level_offset_settings();
-extern void lv_clear_auto_level_offset_settings();
+void lv_draw_auto_level_offset_settings();
+void lv_clear_auto_level_offset_settings();
 
 #ifdef __cplusplus
   } /* C-declarations for C++ */

Marlin/src/lcd/extui/lib/mks_ui/draw_baby_stepping.h

@@ -25,10 +25,10 @@
   extern "C" { /* C-declarations for C++ */
 #endif
 
-extern void lv_draw_baby_stepping();
-extern void lv_clear_baby_stepping();
-extern void disp_baby_step_dist();
-extern void disp_z_offset_value();
+void lv_draw_baby_stepping();
+void lv_clear_baby_stepping();
+void disp_baby_step_dist();
+void disp_z_offset_value();
 
 #ifdef __cplusplus
   } /* C-declarations for C++ */

Marlin/src/lcd/extui/lib/mks_ui/draw_change_speed.h

@@ -28,11 +28,11 @@
 #define MIN_EXT_SPEED_PERCENT    10
 #define MAX_EXT_SPEED_PERCENT   999
 
-extern void lv_draw_change_speed();
-extern void lv_clear_change_speed();
-extern void disp_speed_step();
-extern void disp_print_speed();
-extern void disp_speed_type();
+void lv_draw_change_speed();
+void lv_clear_change_speed();
+void disp_speed_step();
+void disp_print_speed();
+void disp_speed_type();
 
 #ifdef __cplusplus
   } /* C-declarations for C++ */

Marlin/src/lcd/extui/lib/mks_ui/draw_cloud_bind.h

@@ -25,12 +25,12 @@
 extern "C" { /* C-declarations for C++ */
 #endif
 
-extern void lv_draw_cloud_bind();
-extern void lv_clear_cloud_bind();
-extern void disp_bind_state();
-extern void refresh_bind_ui();
-extern void display_qrcode(uint8_t *qrcode_data);
-extern void cloud_unbind();
+void lv_draw_cloud_bind();
+void lv_clear_cloud_bind();
+void disp_bind_state();
+void refresh_bind_ui();
+void display_qrcode(uint8_t *qrcode_data);
+void cloud_unbind();
 
 #ifdef __cplusplus
 } /* C-declarations for C++ */

Marlin/src/lcd/extui/lib/mks_ui/draw_dialog.h

@@ -74,11 +74,11 @@ enum {
   DIALOG_TRANSFER_NO_DEVICE
 };
 
-extern void lv_draw_dialog(uint8_t type);
-extern void lv_clear_dialog();
-extern void filament_sprayer_temp();
-extern void filament_dialog_handle();
-extern void lv_filament_setbar();
+void lv_draw_dialog(uint8_t type);
+void lv_clear_dialog();
+void filament_sprayer_temp();
+void filament_dialog_handle();
+void lv_filament_setbar();
 
 #ifdef __cplusplus
   } /* C-declarations for C++ */