firmware: arm_ffa: Skip free_pages on RX buffer alloc failure

firmware: arm_ffa: Skip free_pages on RX buffer alloc failure

If the RX buffer allocation fails in ffa_init(), the error path jumps to
free_pages even though no buffer has been allocated yet. Route that case
directly to free_drv_info so the cleanup path is only used after at
least one RX/TX buffer allocation has succeeded.

Fixes: 3bbfe9871005 ("firmware: arm_ffa: Add initial Arm FFA driver support")
Link: https://patch.msgid.link/20260428-ffa_fixes-v2-2-8595ae450034@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>