net: lan743x: Remove extranous gotos

The gotos for cleanup aren't required, the function
might as well just return the actual error code.

Signed-off-by: Moritz Fischer <moritzf@google.com>
Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>