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