sparse pointer use of zero as null

Get rid of sparse related warnings from places that use integer as NULL
pointer.

[[email protected]: coding-style fixes]
Signed-off-by: Stephen Hemminger <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jeff Garzik <[email protected]>
Cc: Matt Mackall <[email protected]>
Cc: Ian Kent <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Davide Libenzi <[email protected]>
Cc: Stephen Smalley <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
20 files changed