mac80211: rt2x00: fix eeprom load from PCI eFuse

When eeprom name is not defined, the file load function should
return an error code so that it can fallthrough to read eeprom
form NIC inside eFuse.

Fixes: https://github.com/openwrt/openwrt/issues/17854
Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/17892
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit 693108a31835d43d5e92f116b4dbd9fbed06b7ed)

package/kernel/mac80211/patches/rt2x00/602-01-wifi-rt2x00-Add-support-for-loading-EEPROM-from-user.patch

@@ -151,7 +151,7 @@ Signed-off-by: Christian Marangi <[email protected]>
 +	}
 +
 +	if (!ee_name)
-+		return 0;
++		return -ENOENT;
 +
 +	rt2x00_info(rt2x00dev, "Loading EEPROM data from '%s'.\n", ee_name);
 +