V4L/DVB (7696): pvrusb2: state control tweak

Don't trigger a pathway state change if it's already been triggered
(eliminates some wasted processing and some debug output noise)
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/pvrusb2/pvrusb2-hdw.c

@@ -2401,7 +2401,7 @@ static int pvr2_hdw_commit_execute(struct pvr2_hdw *hdw)
 		}
 	}
 
-	if (hdw->input_dirty &&
+	if (hdw->input_dirty && hdw->state_pathway_ok &&
 	    (((hdw->input_val == PVR2_CVAL_INPUT_DTV) ?
 	      PVR2_PATHWAY_DIGITAL : PVR2_PATHWAY_ANALOG) !=
 	     hdw->pathway_state)) {