rivafb: handle I2C bus creation failure

I2C bus creation may fail, let rivafb handle that case properly.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NAntonino Daplas <adaplas@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/riva/fbdev.c

@@ -1789,6 +1789,8 @@ static int __devinit riva_get_EDID_i2c(struct fb_info *info)
 	NVTRACE_ENTER();
 	riva_create_i2c_busses(par);
 	for (i = 0; i < par->bus; i++) {
+		if (!par->chan[i].par)
+			continue;
 		riva_probe_i2c_connector(par, i+1, &par->EDID);
 		if (par->EDID && !fb_parse_edid(par->EDID, &var)) {
 			printk(PFX "Found EDID Block from BUS %i\n", i);