[PATCH] mm/nommu.c: try to fix __vmalloc

Linus changed the second argument of __vmalloc from int to unsigned int
breaking the compilation for CONFIG_MMU=n configurations (since he only
changed vmalloc.c but not nommu.c).

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>