intel/tools: fix possible randomly increased verbosity of error2aub

Found by Coverity.

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6667>

src/intel/tools/error2aub.c

@@ -240,7 +240,7 @@ int
 main(int argc, char *argv[])
 {
    int i, c;
-   bool help = false, verbose;
+   bool help = false, verbose = false;
    char *out_filename = NULL, *in_filename = NULL;
    const struct option aubinator_opts[] = {
       { "help",       no_argument,       NULL,     'h' },