mac80211: mesh only parameter mppath maybe unused

mppath is mesh related parameter and maybe unused

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index dc261bb..2378305 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1750,7 +1750,7 @@
 	__le16 fc;
 	struct ieee80211_hdr hdr;
 	struct ieee80211s_hdr mesh_hdr __maybe_unused;
-	struct mesh_path *mppath = NULL;
+	struct mesh_path __maybe_unused *mppath = NULL;
 	const u8 *encaps_data;
 	int encaps_len, skip_header_bytes;
 	int nh_pos, h_pos;