[media] cx88: remove return after BUG()

As reported by smatch:

drivers/media/pci/cx88/cx88-video.c:699 get_queue() info: ignoring unreachable code.
drivers/media/pci/cx88/cx88-video.c:714 get_resource() info: ignoring unreachable code.
drivers/media/pci/cx88/cx88-video.c:815 video_read() info: ignoring unreachable code.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/pci/cx88/cx88-video.c b/drivers/media/pci/cx88/cx88-video.c
index ed8cb90..ce27e6d 100644
--- a/drivers/media/pci/cx88/cx88-video.c
+++ b/drivers/media/pci/cx88/cx88-video.c
@@ -696,7 +696,6 @@
 		return &fh->vbiq;
 	default:
 		BUG();
-		return NULL;
 	}
 }
 
@@ -711,7 +710,6 @@
 		return RESOURCE_VBI;
 	default:
 		BUG();
-		return 0;
 	}
 }
 
@@ -812,7 +810,6 @@
 					    file->f_flags & O_NONBLOCK);
 	default:
 		BUG();
-		return 0;
 	}
 }