LSM: Add 'name' field for SafeSetID in DEFINE_LSM

Without this, system boot was crashing with:

[0.174285] LSM: Security Framework initializing
[0.175277] BUG: unable to handle kernel NULL pointer dereference
...
[0.176272] Call Trace:
[0.176272]  ordered_lsm_parse+0x112/0x20b
[0.176272]  security_init+0x9b/0x3ab
[0.176272]  start_kernel+0x413/0x479
[0.176272]  secondary_startup_64+0xa4/0xb0
Signed-off-by: Micah Morton <mortonm@chromium.org>
Fixed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>

security/safesetid/lsm.c

@@ -274,4 +274,5 @@ static int __init safesetid_security_init(void)
 
 DEFINE_LSM(safesetid_security_init) = {
 	.init = safesetid_security_init,
+	.name = "safesetid",
 };