qtest: escape device name in device-introspect-test

device-introspect-test uses HMP, so it should escape the device name
properly.  Because of this, a few devices that had commas in their
names were escaping testing.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/qtest/device-introspect-test.c

@@ -104,7 +104,8 @@ static QList *device_type_list(QTestState *qts, bool abstract)
 static void test_one_device(QTestState *qts, const char *type)
 {
     QDict *resp;
-    char *help;
+    char *help, *escaped;
+    GRegex *comma;
 
     g_test_message("Testing device '%s'", type);
 
@@ -113,8 +114,13 @@ static void test_one_device(QTestState *qts, const char *type)
                type);
     qobject_unref(resp);
 
-    help = qtest_hmp(qts, "device_add \"%s,help\"", type);
+    comma = g_regex_new(",", 0, 0, NULL);
+    escaped = g_regex_replace_literal(comma, type, -1, 0, ",,", 0, NULL);
+    g_regex_unref(comma);
+
+    help = qtest_hmp(qts, "device_add \"%s,help\"", escaped);
     g_free(help);
+    g_free(escaped);
 }
 
 static void test_device_intro_list(void)