Replace the custom CHAR_IS_NUM() macro with isdigit() from <linux/ctype.h>
Signed-off-by: NTobias Klauser <tklauser@nuerscht.ch>
Acked-by: N"Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>