iwlwifi: mvm: improve MCS rate warning

The warning gives no information about the frame, and presents
the flags so that one might think they're the frame. Clarify
and add more information.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/tx.c

@@ -189,8 +189,10 @@ static void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm,
 
 	/* HT rate doesn't make sense for a non data frame */
 	WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
-		  "Got an HT rate for a non data frame 0x%x\n",
-		  info->control.rates[0].flags);
+		  "Got an HT rate (flags:0x%x/mcs:%d) for a non data frame (fc:0x%x)\n",
+		  info->control.rates[0].flags,
+		  info->control.rates[0].idx,
+		  le16_to_cpu(fc));
 
 	rate_idx = info->control.rates[0].idx;
 	/* if the rate isn't a well known legacy rate, take the lowest one */