Fix inlining of Kyber re-encryption #339
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Unfortunately, I have forgotten to include the inlining of the re-encryption in the kem.c when I updated to the NIST draft version in #332.
I fixed it here. This reduces the stack usage of decaps by 1 ciphertext size.
There was also a bug in the inlined re-encryption that resulted in the re-encryption always failing (but that was dead code).