iwlagn: send tx power command if defer cause by RXON not match

During channge channel, tx power will not send to uCode, the tx power command
should send after scan complete. but should also can send after RXON command.

Stable fix identified by Stanislaw Gruszka <sgruszka@redhat.com>.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Cc: stable@kernel.org [2.6.38+]
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn-rxon.c

@@ -370,6 +370,11 @@ int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 		}
 
 		memcpy(active, &ctx->staging, sizeof(*active));
+		/*
+		 * We do not commit tx power settings while channel changing,
+		 * do it now if after settings changed.
+		 */
+		iwl_set_tx_power(priv, priv->tx_power_next, false);
 		return 0;
 	}