utils: ipu3-unpack: Fix error string

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

utils/ipu3/ipu3-unpack.c

@@ -79,7 +79,7 @@ int main(int argc, char *argv[])
 
 		ret = write(out_fd, out_data, 50);
 		if (ret < -1) {
-			fprintf(stderr, "Failed to read input data: %s\n",
+			fprintf(stderr, "Failed to write output data: %s\n",
 				strerror(errno));
 			goto done;
 		}