[Mono][AOT] Add missing unlock in mono_aot_get_class_from_name if aot table_size == 0 (#122097)

Fixes #122096

Author: andrew-kulikov

src/mono/mono/mini/aot-runtime.c

@@ -2709,8 +2709,10 @@ mono_aot_get_class_from_name (MonoImage *image, const char *name_space, const ch
 	table_size = amodule->class_name_table [0];
 	table = amodule->class_name_table + 1;
 
-	if (table_size == 0)
+	if (table_size == 0) {
+		amodule_unlock (amodule);
 		return FALSE;
+	}
 
 	if (name_space [0] == '\0')
 		full_name = g_strdup_printf ("%s", name);