UPSTREAM: selinux: Remove unnecessary check of array base in selinux_set_mapping()

UPSTREAM: selinux: Remove unnecessary check of array base in selinux_set_mapping()

'perms' will never be NULL since it isn't a plain pointer but an array
of u32 values.

This fixes the following warning when building with clang:

security/selinux/ss/services.c:158:16: error: address of array
'p_in->perms' will always evaluate to 'true'
[-Werror,-Wpointer-bool-conversion]
                while (p_in->perms && p_in->perms[k]) {

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Link: https://git.kernel.org/linus/342e91578eb6909529bc7095964cd44b9c057c4e
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Change-Id: Iacc441a51a908c5fc3fcbd7874802b8eb889f828