media: mt312: fix a missing check of mt312 reset

mt312_reset() may fail. Although it is called in the end of
mt312_set_frontend(), we better check its status and return its error
code upstream instead of 0.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Reviewed-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/dvb-frontends/mt312.c

@@ -645,7 +645,9 @@ static int mt312_set_frontend(struct dvb_frontend *fe)
 	if (ret < 0)
 		return ret;
 
-	mt312_reset(state, 0);
+	ret = mt312_reset(state, 0);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }