Staging: xgifb: Fixed up a errors "do not initialise statics to 0 or NULL" in XGI_main_26.c

This is a patch to the XGI_main_26.c file that fixed up a errors "do not initialise statics to 0 or NULL" found by the checkpatch.pl tools.

Signed-off-by: Ruslan Pisarev <ruslan@rpisarev.org.ua>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>