iwlwifi: mvm: handle error from iwl_trans_update_sf

iwl_trans_update_sf can fail and this wasn't handled.
Fix this.

Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/fw.c b/drivers/net/wireless/iwlwifi/mvm/fw.c
index e0d9f19..8c96e5a 100644
--- a/drivers/net/wireless/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/iwlwifi/mvm/fw.c
@@ -227,6 +227,10 @@
 	st_fwrd_space.addr = mvm->sf_space.addr;
 	st_fwrd_space.size = mvm->sf_space.size;
 	ret = iwl_trans_update_sf(mvm->trans, &st_fwrd_space);
+	if (ret) {
+		IWL_ERR(mvm, "Failed to update SF size. ret %d\n", ret);
+		return ret;
+	}
 
 	iwl_trans_fw_alive(mvm->trans, alive_data.scd_base_addr);