block: row: Some good tweaks from around the forum

Conflicts:

	block/row-iosched.c

Change-Id: I40b5571314c11cf53f063fe0c00e920b72155a85
block: deadline: Some good tweaks from around the forum

Conflicts:

	block/deadline-iosched.c

Change-Id: I02f34d737e295e994c1c7dde06414c3902d6dd93
oops

Change-Id: I5539e2e79da46bcceab0c05c97bd603ce653667a