nettle-pbkdf2: Added missing deallocation.

ChangeLog

+2014-02-13  Niels Möller  <nisse@lysator.liu.se>
+
+	* tools/nettle-pbkdf2.c (main): Added missing deallocation.
+
 2014-02-12  Niels Möller  <nisse@lysator.liu.se>
 
 	* chacha-poly1305.h: New file.

tools/nettle-pbkdf2.c

@@ -173,6 +173,8 @@ main (int argc, char **argv)
       hex[BASE16_ENCODE_LENGTH(output_length - i)] = 0;
       printf("%s\n", hex);
     }
+  free (output);
+
   if (fflush(stdout) != 0 )
     die("Write failed: %s\n", STRERROR(errno));