fix scan-build warnings

Author: sjaeckel

src/encauth/ccm/ccm_memory.c

@@ -78,6 +78,9 @@ int ccm_memory(int cipher,
    if (*taglen < 4 || *taglen > 16 || (*taglen % 2) == 1 || headerlen > 0x7fffffffu) {
       return CRYPT_INVALID_ARG;
    }
+   if (noncelen < 7) {
+      return CRYPT_INVALID_ARG;
+   }
 
    /* is there an accelerator? */
    if (cipher_descriptor[cipher].accel_ccm_memory != NULL) {
@@ -144,7 +147,7 @@ int ccm_memory(int cipher,
             (L-1));
 
    /* nonce */
-   for (y = 0; y < 15 - L; y++) {
+   for (y = 0; y < noncelen; y++) {
        PAD[x++] = nonce[y];
    }