net: ag71xx: move assignment into main loop

Effectively what's going on here is there's a main loop and an identical
one below with a single assignment. Simpler to move it up.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20240930181823.288892-6-rosenp@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>