staging/xgifb: Remove always false comparisons
This patch removes some comparisons that always evaluate to false since xoffset and yoffset are defined as __u32 in fb_var_screeninfo in include/linux/fb.h and thus can never be negative. Signed-off-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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