[PATCH] Kill signed chars

scripts/ is full of mismatches between char* params an signed char* arguments,
and viceversa.  gcc4 now complaints loud about this.  Patch below deletes all
those 'signed'.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>