mwifiex: fix missing break on IEEE80211_STYPE_ACTION case

The IEEE80211_STYPE_ACTION case is missing a break in the switch
statement, causing it to fall through to the default case that
reports a debug message about an unknown frame subtype. Fix this
by adding in the missing break statement.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/util.c

@@ -386,6 +386,7 @@ mwifiex_parse_mgmt_packet(struct mwifiex_private *priv, u8 *payload, u16 len,
 				    "unknown public action frame category %d\n",
 				    category);
 		}
+		break;
 	default:
 		mwifiex_dbg(priv->adapter, INFO,
 		    "unknown mgmt frame subtype %#x\n", stype);