qtest: Fix the bug about disable vnc causes "make check" fail

When we disable vnc from "./configure", QEMU can't use the vnc option.
So qtest can't use the "vnc -none ", otherwise "make check" fails.
If QEMU uses "-display none", "-vnc none" is excrescent, So we just need to drop it.
Signed-off-by: NKewei Yu <keweihk@gmail.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/fdc-test.c

@@ -518,7 +518,6 @@ static void fuzz_registers(void)
 int main(int argc, char **argv)
 {
     const char *arch = qtest_get_arch();
-    char *cmdline;
     int fd;
     int ret;
 
@@ -538,9 +537,7 @@ int main(int argc, char **argv)
     /* Run the tests */
     g_test_init(&argc, &argv, NULL);
 
-    cmdline = g_strdup_printf("-vnc none ");
-
-    qtest_start(cmdline);
+    qtest_start(NULL);
     qtest_irq_intercept_in(global_qtest, "ioapic");
     qtest_add_func("/fdc/cmos", test_cmos);
     qtest_add_func("/fdc/no_media_on_start", test_no_media_on_start);

tests/ide-test.c

@@ -380,7 +380,6 @@ static void test_bmdma_no_busmaster(void)
 static void test_bmdma_setup(void)
 {
     ide_test_start(
-        "-vnc none "
         "-drive file=%s,if=ide,serial=%s,cache=writeback "
         "-global ide-hd.ver=%s",
         tmp_path, "testdisk", "version");
@@ -410,7 +409,6 @@ static void test_identify(void)
     int ret;
 
     ide_test_start(
-        "-vnc none "
         "-drive file=%s,if=ide,serial=%s,cache=writeback "
         "-global ide-hd.ver=%s",
         tmp_path, "testdisk", "version");
@@ -455,7 +453,6 @@ static void test_flush(void)
     uint8_t data;
 
     ide_test_start(
-        "-vnc none "
         "-drive file=blkdebug::%s,if=ide,cache=writeback",
         tmp_path);