crypto: tcrypt - clamp num_mb to avoid divide-by-zero

Passing num_mb=0 to the multibuffer speed tests leaves test_mb_aead_cycles()
and test_mb_acipher_cycles() dividing by (8 * num_mb). With sec=0 (the
default), the module prints "1 operation in ..." and hits a divide-by-zero
fault.

Force num_mb to at least 1 during module init and warn the caller so the
warm-up loop and the final report stay well-defined.

To reproduce:
sudo modprobe tcrypt mode=600 num_mb=0

Signed-off-by: Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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