MIPS: module: Ensure we always clean up r_mips_hi16_list

MIPS: module: Ensure we always clean up r_mips_hi16_list

If we hit an error whilst processing a reloc then we would return early
from apply_relocate & potentially not free entries in r_mips_hi16_list,
thereby leaking memory. Fix this by ensuring that we always run the code
to free r_mipps_hi16_list when errors occur.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 28e20668d01c ("MIPS: Fix race condition in module relocation code.")
Fixes: a39d8aef61c8 ("MIPS: Bail on unsupported module relocs")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15831/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>