KEYS: trusted: Fix migratable=1 failing

Consider the following transcript:

$ keyctl add trusted kmk "new 32 blobauth=helloworld keyhandle=80000000 migratable=1" @U
add_key: Invalid argument

The documentation has the following description:

  migratable=   0|1 indicating permission to reseal to new PCR values,
                default 1 (resealing allowed)

The consequence is that "migratable=1" should succeed. Fix this by
allowing this condition to pass instead of return -EINVAL.

[*] Documentation/security/keys/trusted-encrypted.rst

Cc: [email protected]
Cc: "James E.J. Bottomley" <[email protected]>
Cc: Mimi Zohar <[email protected]>
Cc: David Howells <[email protected]>
Fixes: d00a1c7 ("keys: add new trusted key-type")
Signed-off-by: Jarkko Sakkinen <[email protected]>

security/keys/trusted-keys/trusted_tpm1.c

@@ -801,7 +801,7 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 		case Opt_migratable:
 			if (*args[0].from == '0')
 				pay->migratable = 0;
-			else
+			else if (*args[0].from != '1')
 				return -EINVAL;
 			break;
 		case Opt_pcrlock: