dcr_map is called in the previous if and therefore needs to be unmapped.

Fixes: 1ff0fcfc ("ibm_newemac: Fix new MAL feature handling")
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20241007235711.5714-1-rosenp@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>