Fix `unused-result' warnings.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>

clients/dnd.c

@@ -272,7 +272,9 @@ data_source_send(void *data, struct wl_data_source *source,
 	dnd_flower_message.x_offset = dnd_drag->x_offset;
 	dnd_flower_message.y_offset = dnd_drag->y_offset;
 
-	write(fd, &dnd_flower_message, sizeof dnd_flower_message);
+	if (write(fd, &dnd_flower_message, sizeof dnd_flower_message) < 0)
+		abort();
+
 	close(fd);
 }
 

clients/window.c

@@ -1984,7 +1984,9 @@ data_offer_receive_data(struct data_offer *offer, const char *mime_type,
 {
 	int p[2];
 
-	pipe2(p, O_CLOEXEC);
+	if (pipe2(p, O_CLOEXEC) == -1)
+		return;
+
 	wl_data_offer_receive(offer->offer, mime_type, p[1]);
 	close(p[1]);
 

shared/image-loader.c

@@ -157,7 +157,7 @@ read_func(png_structp png, png_bytep data, png_size_t size)
 {
 	FILE *fp = png_get_io_ptr(png);
 
-	if (fread(data, 1, size, fp) < 0)
+	if (fread(data, 1, size, fp) != size)
 		png_error(png, NULL);
 }
 
@@ -356,7 +356,9 @@ load_image(const char *filename)
 	if (fp == NULL)
 		return NULL;
 
-	fread(header, sizeof header, 1, fp);
+	if (fread(header, sizeof header, 1, fp) != 1)
+		return NULL;
+
 	rewind(fp);
 	for (i = 0; i < ARRAY_LENGTH(loaders); i++) {
 		if (memcmp(header, loaders[i].header,