Merge pull request #144 from libtom/fix/coverity-dsa_import-double-free

fix coverity finding: dsa_import double free

src/pk/dsa/dsa_import.c

@@ -99,14 +99,16 @@ int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
          goto LBL_ERR;
       }
 
-      err = der_decode_subject_public_key_info(in, inlen,
-        PKA_DSA, tmpbuf, &tmpbuf_len,
-        LTC_ASN1_SEQUENCE, params, 3);
+      err = der_decode_subject_public_key_info(in, inlen, PKA_DSA,
+                                               tmpbuf, &tmpbuf_len,
+                                               LTC_ASN1_SEQUENCE, params, 3);
       if (err != CRYPT_OK) {
+         XFREE(tmpbuf);
          goto LBL_ERR;
       }
 
       if ((err=der_decode_integer(tmpbuf, tmpbuf_len, key->y)) != CRYPT_OK) {
+         XFREE(tmpbuf);
          goto LBL_ERR;
       }
 
@@ -125,7 +127,6 @@ LBL_OK:
 
   return CRYPT_OK;
 LBL_ERR:
-   XFREE(tmpbuf);
    mp_clear_multi(key->p, key->g, key->q, key->x, key->y, NULL);
    return err;
 }