Check zalloc return for out of memory situation

Most zalloc calls in weston are checked, this fixes a handful that were
being ignored.  As found by `grep -EIsr "[^x]zalloc\(" . -A1`

Signed-off-by: Bryce Harrington <b.harrington@samsung.com>

src/compositor-wayland.c

@@ -256,6 +256,12 @@ wayland_output_get_shm_buffer(struct wayland_output *output)
 	}
 
 	sb = zalloc(sizeof *sb);
+	if (sb == NULL) {
+		weston_log("could not zalloc %ld memory for sb: %m\n", sizeof *sb);
+		close(fd);
+		free(data);
+		return NULL;
+	}
 
 	sb->output = output;
 	wl_list_init(&sb->free_link);

src/libinput-seat.c

@@ -330,9 +330,9 @@ udev_seat_create(struct udev_input *input, const char *seat_name)
 	struct udev_seat *seat;
 
 	seat = zalloc(sizeof *seat);
-
 	if (!seat)
 		return NULL;
+
 	weston_seat_init(&seat->base, c, seat_name);
 	seat->base.led_update = udev_seat_led_update;
 

src/screenshooter.c

@@ -449,6 +449,17 @@ weston_recorder_frame_notify(struct wl_listener *listener, void *data)
 		weston_recorder_destroy(recorder);
 }
 
+static void
+weston_recorder_free(struct weston_recorder *recorder)
+{
+	if (recorder == NULL)
+		return;
+	free(recorder->rect);
+	free(recorder->tmpbuf);
+	free(recorder->frame);
+	free(recorder);
+}
+
 static void
 weston_recorder_create(struct weston_output *output, const char *filename)
 {
@@ -461,7 +472,6 @@ weston_recorder_create(struct weston_output *output, const char *filename)
 	do_yflip = !!(compositor->capabilities & WESTON_CAP_CAPTURE_YFLIP);
 
 	recorder = malloc(sizeof *recorder);
-
 	if (recorder == NULL) {
 		weston_log("%s: out of memory\n", __func__);
 		return;
@@ -476,6 +486,12 @@ weston_recorder_create(struct weston_output *output, const char *filename)
 	recorder->destroying = 0;
 	recorder->output = output;
 
+	if ((recorder->frame == NULL) || (recorder->rect == NULL)) {
+		weston_log("%s: out of memory\n", __func__);
+		weston_recorder_free(recorder);
+		return;
+	}
+
 	if (do_yflip)
 		recorder->tmpbuf = NULL;
 	else
@@ -493,10 +509,7 @@ weston_recorder_create(struct weston_output *output, const char *filename)
 		break;
 	default:
 		weston_log("unknown recorder format\n");
-		free(recorder->rect);
-		free(recorder->tmpbuf);
-		free(recorder->frame);
-		free(recorder);
+		weston_recorder_free(recorder);
 		return;
 	}
 
@@ -505,10 +518,7 @@ weston_recorder_create(struct weston_output *output, const char *filename)
 
 	if (recorder->fd < 0) {
 		weston_log("problem opening output file %s: %m\n", filename);
-		free(recorder->rect);
-		free(recorder->tmpbuf);
-		free(recorder->frame);
-		free(recorder);
+		weston_recorder_free(recorder);
 		return;
 	}
 
@@ -527,11 +537,8 @@ weston_recorder_destroy(struct weston_recorder *recorder)
 {
 	wl_list_remove(&recorder->frame_listener.link);
 	close(recorder->fd);
-	free(recorder->tmpbuf);
-	free(recorder->frame);
-	free(recorder->rect);
 	recorder->output->disable_planes--;
-	free(recorder);
+	weston_recorder_free(recorder);
 }
 
 static void

src/udev-seat.c

@@ -373,9 +373,9 @@ udev_seat_create(struct udev_input *input, const char *seat_name)
 	struct udev_seat *seat;
 
 	seat = zalloc(sizeof *seat);
-
 	if (!seat)
 		return NULL;
+
 	weston_seat_init(&seat->base, c, seat_name);
 	seat->base.led_update = drm_led_update;