soc/amd/common/block/cpu/noncar/memmap: simplify return value check

soc/amd/common/block/cpu/noncar/memmap: simplify return value check

Since the return value of the fsp_find_range_hob call is only used in
one location, move the call and return value check into the if condition
block to not need the status variable.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I4b9e9251368b86382dc4e050cf176db79dbfb230
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74081
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>