spi-flash: fix newline in fprintf()

spi_flash.c

@@ -144,7 +144,7 @@ void spi_flash_erase(FILE *fp, uint32_t dev, uint32_t addr, size_t len)
 		default: goto err_disable_write;
 		};
 
-		fprintf(fp, "addr: %lx; size: %u\n", addr, size);
+		fprintf(fp, "addr: %lx; size: %u\r\n", addr, size);
 		spi_flash_addr(cmd, addr);
 		spi_send_cmd(dev, cmd, 4, NULL, 0);
 	}