Add (int) cast in LWIP_DEBUGF() to avoid compiler warnings about comparison.
diff --git a/src/include/lwip/debug.h b/src/include/lwip/debug.h
index 147e87d..4d3425c 100644
--- a/src/include/lwip/debug.h
+++ b/src/include/lwip/debug.h
@@ -71,7 +71,7 @@
/** print debug message only if debug message type is enabled...
* AND is of correct type AND is at least DBG_LEVEL
*/
-# define LWIP_DEBUGF(debug,x) do { if (((debug) & DBG_ON) && ((debug) & DBG_TYPES_ON) && (((debug) & DBG_MASK_LEVEL) >= DBG_MIN_LEVEL)) { LWIP_PLATFORM_DIAG(x); if ((debug) & DBG_HALT) while(1); } } while(0)
+# define LWIP_DEBUGF(debug,x) do { if (((debug) & DBG_ON) && ((debug) & DBG_TYPES_ON) && ((int)((debug) & DBG_MASK_LEVEL) >= DBG_MIN_LEVEL)) { LWIP_PLATFORM_DIAG(x); if ((debug) & DBG_HALT) while(1); } } while(0)
# define LWIP_ERROR(x) do { LWIP_PLATFORM_DIAG(x); } while(0)
#else /* LWIP_DEBUG */
# define LWIP_DEBUGF(debug,x)
