net: ftgmac100: Simplify error handling for ftgmac100_initial_mac

net: ftgmac100: Simplify error handling for ftgmac100_initial_mac

ftgmac100_initial_mac() does not allocate any resources. All resources
by the probe function up until this call point use devm_ methods. So
just return the error code rather than use a goto.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
Link: https://patch.msgid.link/20260206-ftgmac-cleanup-v5-7-ad28a9067ea7@aspeedtech.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>