linux-pipewire: Fix uninitialized camera resolution access

The use of `SPA_POD_OPT_Rectangle()` means that if the rectangle cannot be
parsed, then no error will be returned. In that case uninitialized variables
will be used. This can happen if the pod object contains e.g. a list of
resolutions (`SPA_CHOICE_Enum`).

Fix that by using `SPA_POD_Rectangle()`, which enforces successful parsing.

Author: pobrn

plugins/linux-pipewire/camera-portal.c

@@ -366,7 +366,7 @@ static void camera_format_list(struct camera_device *dev, obs_property_t *prop)
 		}
 
 		if (spa_pod_parse_object(p->param, SPA_TYPE_OBJECT_Format, format ? &format : NULL,
-					 SPA_FORMAT_VIDEO_size, SPA_POD_OPT_Rectangle(&resolution)) < 0)
+					 SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle(&resolution)) < 0)
 			continue;
 
 		obs_data_set_int(data, "width", resolution.width);
@@ -677,7 +677,7 @@ static bool framerate_list(struct camera_device *dev, uint32_t pixelformat, cons
 			continue;
 
 		if (spa_pod_parse_object(p->param, SPA_TYPE_OBJECT_Format, NULL, SPA_FORMAT_VIDEO_size,
-					 SPA_POD_OPT_Rectangle(&this_resolution)) < 0)
+					 SPA_POD_Rectangle(&this_resolution)) < 0)
 			continue;
 
 		if (this_resolution.width != resolution->width || this_resolution.height != resolution->height)