[PATCH] fbdev: make pxafb more robust to errors with CONFIG_FB_PXA_PARAMETERS

pxafb.c runs into an oops if CONFIG_FB_PXA_PARAMETERS is enabled and no
parameters are set in command line.  The following patch avoids this
problem.
Signed-off-by: NNicolas Pitre <nico@cam.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/video/pxafb.c

@@ -1396,7 +1396,8 @@ static struct platform_driver pxafb_driver = {
 int __devinit pxafb_setup(char *options)
 {
 # ifdef CONFIG_FB_PXA_PARAMETERS
-	strlcpy(g_options, options, sizeof(g_options));
+	if (options)
+		strlcpy(g_options, options, sizeof(g_options));
 # endif
 	return 0;
 }