Minor fix (add some parenthesis where macro expansion could cause problems)

src/include/lwip/def.h

@@ -35,8 +35,8 @@
 /* this might define NULL already */
 #include "arch/cc.h"
 
-#define LWIP_MAX(x , y)  (x) > (y) ? (x) : (y)
-#define LWIP_MIN(x , y)  (x) < (y) ? (x) : (y)
+#define LWIP_MAX(x , y)  (((x) > (y)) ? (x) : (y))
+#define LWIP_MIN(x , y)  (((x) < (y)) ? (x) : (y))
 
 #ifndef NULL
 #define NULL ((void *)0)

src/include/lwip/opt.h

@@ -610,7 +610,7 @@
  * as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work.
  */
 #ifndef TCP_SND_QUEUELEN
-#define TCP_SND_QUEUELEN                4 * TCP_SND_BUF/TCP_MSS
+#define TCP_SND_QUEUELEN                (4 * (TCP_SND_BUF/TCP_MSS))
 #endif
 
 /**
@@ -619,7 +619,7 @@
  * TCP snd_buf for select to return writable.
  */
 #ifndef TCP_SNDLOWAT
-#define TCP_SNDLOWAT                    TCP_SND_BUF/2
+#define TCP_SNDLOWAT                    (TCP_SND_BUF/2)
 #endif
 
 /**

src/include/lwip/sockets.h

@@ -80,7 +80,7 @@ struct sockaddr {
 #define  SO_OOBINLINE   0x0100 /* leave received OOB data in line */
 #define  SO_REUSEPORT   0x0200 /* allow local address & port reuse */
 
-#define SO_DONTLINGER   (int)(~SO_LINGER)
+#define SO_DONTLINGER   ((int)(~SO_LINGER))
 
 /*
  * Additional options, not kept in so_options.