flash: convert 'unsigned' to 'unsigned int'

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>