error: Use error_fatal to simplify obvious fatal errors (again)

We did this with scripts/coccinelle/use-error_fatal.cocci before, in
commit 50beeb68094 and 007b06578ab.  This commit cleans up rarer
variations that don't seem worth matching with Coccinelle.

Cc: Thomas Huth <thuth@redhat.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Juan Quintela <quintela@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210720125408.387910-2-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
diff --git a/qemu-img.c b/qemu-img.c
index 908fd0c..d77f3e7 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -5350,7 +5350,6 @@
 {
     const img_cmd_t *cmd;
     const char *cmdname;
-    Error *local_error = NULL;
     int c;
     static const struct option long_options[] = {
         {"help", no_argument, 0, 'h'},
@@ -5368,10 +5367,7 @@
     module_call_init(MODULE_INIT_TRACE);
     qemu_init_exec_dir(argv[0]);
 
-    if (qemu_init_main_loop(&local_error)) {
-        error_report_err(local_error);
-        exit(EXIT_FAILURE);
-    }
+    qemu_init_main_loop(&error_fatal);
 
     qcrypto_init(&error_fatal);