From 4070abc132bba5ffd032898230263544a8359bb3 Mon Sep 17 00:00:00 2001
From: Daniel Agar <daniel@agar.ca>
Date: Sat, 29 Jul 2017 18:29:00 -0400
Subject: [PATCH] gps fix sign-compare

---
 src/drivers/gps/gps.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/drivers/gps/gps.cpp b/src/drivers/gps/gps.cpp
index 9294a975d3..c2033b0584 100644
--- a/src/drivers/gps/gps.cpp
+++ b/src/drivers/gps/gps.cpp
@@ -404,10 +404,11 @@ int GPS::pollOrRead(uint8_t *buf, size_t buf_length, int timeout)
 			 * If more bytes are available, we'll go back to poll() again.
 			 */
 #ifdef __PX4_NUTTX
-			int err = 0, bytesAvailable = 0;
+			int err = 0;
+			int bytesAvailable = 0;
 			err = ioctl(_serial_fd, FIONREAD, (unsigned long)&bytesAvailable);
 
-			if ((err != 0) || (bytesAvailable < buf_length)) {
+			if ((err != 0) || (bytesAvailable < (int)buf_length)) {
 				usleep(GPS_WAIT_BEFORE_READ * 1000);
 			}