Merge pull request #661 from libtom/fix-ccm

Fix compiler warning

src/encauth/ccm/ccm_add_nonce.c

@@ -58,6 +58,9 @@ int ccm_add_nonce(ccm_state *ccm,
       ccm->PAD[x++] = 0;
    }
    for (; y < ccm->L; y++) {
+      if (x >= sizeof(ccm->PAD)) {
+         return CRYPT_INVALID_ARG;
+      }
       ccm->PAD[x++] = (unsigned char)((len >> 24) & 255);
       len <<= 8;
    }