flash: convert 'unsigned' to 'unsigned int'

Conversion done with
	checkpatch --fix-inplace -types UNSPECIFIED_INT

Ignore the cast as they could be better addressed.
Fix only minor additional checkpatch issue (spacing and line
length).

Change-Id: Id808747855a02052f3738e2d232bff4dd99b27f1
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8479
Tested-by: jenkins
Reviewed-by: zapb <dev@zapb.de>

src/flash/common.h

@@ -17,7 +17,7 @@
  * name provides a suffix but it does not parse as an unsigned integer,
  * the routine returns ~0U.  This will prevent further matching.
  */
-unsigned get_flash_name_index(const char *name);
+unsigned int get_flash_name_index(const char *name);
 /**
  * Attempt to match the @c expected name with the @c name of a driver.
  * @param name The name of the driver (from the bank's device structure).