iwl3945: re-add iwl_poll_direct_bit return value check

Re-add the iwl_poll_direct_bit return value assignment dropped in
"iwl3945: add apm ops".

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 6ae0df5..0a75053 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -1073,7 +1073,7 @@
 	* D0U* --> D0A* state */
 	iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 
-	iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
+	ret = iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
 			    CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
 	if (ret < 0) {
 		IWL_DEBUG_INFO(priv, "Failed to init the card\n");