fdtoverlay: remove wrong singular article in a comment

Signed-off-by: Markus Heidelberg <[email protected]>
Signed-off-by: David Gibson <[email protected]>

Author: marcows

fdtoverlay.c

@@ -48,7 +48,7 @@ static void *apply_one(char *base, const char *overlay, size_t *buf_len,
 	int ret;
 
 	/*
-	 * We take a copies first, because a failed apply can trash
+	 * We take copies first, because a failed apply can trash
 	 * both the base blob and the overlay
 	 */
 	tmpo = xmalloc(fdt_totalsize(overlay));