[PATCH] mm: clean up local variables

Clean up a local variable with the same name as a variable in a larger
block.  Also move a variable into the block where it's actually used.

Spotted by http://linuxicc.sourceforge.net/



Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>