screencast: use asserts for fatal errors

src/screencast/pipewire_screencast.c

@@ -201,10 +201,7 @@ void xdpw_pwr_enqueue_buffer(struct xdpw_screencast_instance *cast) {
 	struct pw_buffer *pw_buf = cast->current_frame.current_pw_buffer;
 	bool buffer_corrupt = cast->frame_state != XDPW_FRAME_STATE_SUCCESS;
 
-	if (!pw_buf) {
-		logprint(TRACE, "pipewire: no pipewire buffer to queue");
-		return;
-	}
+	assert(pw_buf);
 
 	struct spa_buffer *spa_buf = pw_buf->buffer;
 	struct spa_data *d = spa_buf->datas;

src/screencast/wlr_screencast.c

@@ -12,6 +12,7 @@
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>
+#include <assert.h>
 #include <wayland-client-protocol.h>
 
 #include "screencast.h"
@@ -151,10 +152,7 @@ static void wlr_frame_buffer_done(void *data,
 		return;
 	}
 
-	if (cast->current_frame.buffer == NULL) {
-		logprint(ERROR, "wlroots: imported buffer doesn't contain a wlr_buffer");
-		abort();
-	}
+	assert(cast->current_frame.buffer);
 
 	zwlr_screencopy_frame_v1_copy_with_damage(frame, cast->current_frame.buffer);
 	logprint(TRACE, "wlroots: frame copied");