main: disable libv4l for USERPTRuserptr

The libv4l emulation doesn't support USERPTR. So, disable it,
when this mode is used.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index ea57394..8b31b6d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -144,6 +144,7 @@ static void activate(GtkApplication *app)
     } else if (use_userptr) {
         printf("Forcing userptr mode\n");
         cam->userptr = TRUE;
+        cam->use_libv4l = FALSE;
     }
 
     cam->xml = gtk_builder_new();