net: phylink: simplify phylink_resolve() -> phylink_major_config() path

net: phylink: simplify phylink_resolve() -> phylink_major_config() path

This is a trivial change with no functional effect which replaces the
pattern:

if (a) {
	if (b) {
		do_stuff();
	}
}

with:

if (a && b) {
	do_stuff();
};

The purpose is to reduce the delta of a subsequent functional change.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20260119121954.1624535-2-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>