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/nor/drivers.c

@@ -91,7 +91,7 @@ static const struct flash_driver * const flash_drivers[] = {
 
 const struct flash_driver *flash_driver_find_by_name(const char *name)
 {
-	for (unsigned i = 0; flash_drivers[i]; i++) {
+	for (unsigned int i = 0; flash_drivers[i]; i++) {
 		if (strcmp(name, flash_drivers[i]->name) == 0)
 			return flash_drivers[i];
 	}