bnxt_en: Fix return code to "flash_device".

When NVRAM directory is not found, return the error code
properly as per firmware command failure instead of the hardcode
-ENOBUFS.

Fixes: 3a707bed ("bnxt_en: Return -EAGAIN if fw command returns BUSY")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -2012,11 +2012,12 @@ int bnxt_flash_package_from_file(struct net_device *dev, const char *filename,
 
 	bnxt_hwrm_fw_set_time(bp);
 
-	if (bnxt_find_nvram_item(dev, BNX_DIR_TYPE_UPDATE,
+	rc = bnxt_find_nvram_item(dev, BNX_DIR_TYPE_UPDATE,
 				  BNX_DIR_ORDINAL_FIRST, BNX_DIR_EXT_NONE,
-				 &index, &item_len, NULL) != 0) {
+				  &index, &item_len, NULL);
+	if (rc) {
 		netdev_err(dev, "PKG update area not created in nvram\n");
-		return -ENOBUFS;
+		return rc;
 	}
 
 	rc = request_firmware(&fw, filename, &dev->dev);