af_key: return error if pfkey_xfrm_policy2msg_prep() fails
af_key: return error if pfkey_xfrm_policy2msg_prep() fails

The original code saved the error value but just returned 0 in the end.

Signed-off-by: Dan Carpenter <72501f147b2753e6660fdce744d9ac3084854f5e@gmail.com>
Acked-by: Jamal Hadi Salim <f626bfe8a6716f0e60b0f3989b67f5ad2fa9fda2@mojatatu.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas