guchar -> gchar?

[Lutz Müller <lutz users sourceforge net>]

Hello!

Latest gcc produces lots of warnings like:

gnome-print.c:738: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness

the reason being gcc complaining about using unsigned char for standard strings instead of char.

Would it generate any problems elsewhere (compatiblity?) if we just
changed the API from guchar* to gchar* for standard strings in a couple
of places (namely gnome-print.h and gnome-print-config.h)?

Regards
-- 
Lutz Müller <lutz users sourceforge net>