[media] em28xx: remove dead code

As reported by smatch:
drivers/media/usb/em28xx/em28xx-video.c:842 get_ressource() info: ignoring unreachable code.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/usb/em28xx/em28xx-video.c

···
 		return EM28XX_RESOURCE_VBI;
 	default:
 		BUG();
-		return 0;
 	}
 }