This patch kills tons of gcc4 warnings:

pointer targets in passing argument 2 of 'csum_and_copy_from_user' differ in signedness		 

From: Hirokazu Takata <takata@linux-m32r.org>

* include/asm-m32r/checksum.h: build fix

* arch/m32r/lib/csum_partial_copy.c:
  - update comment
  - cosmetic changes: change indentation
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>