Fix double-free in virJSONParserHandleStartMap on OOM

If OOM occurs in virJSONParserHandleStartMap it will free
a variable that is owned by another object. This leads to
a later double-free.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/util/virjson.c

@@ -862,7 +862,6 @@ static int virJSONParserHandleStartMap(void *ctx)
 
     if (VIR_REALLOC_N(parser->state,
                       parser->nstate + 1) < 0) {
-        virJSONValueFree(value);
         return 0;
     }