Fixed ERR_IS_FATAL so that ERR_WOULDBLOCK is not fatal.

CHANGELOG

@@ -233,6 +233,9 @@ HISTORY
 
   ++ Bugfixes:
 
+  2010-11-20: Simon Goldschmidt
+  * err.h: Fixed ERR_IS_FATAL so that ERR_WOULDBLOCK is not fatal.
+
   2010-11-20: Simon Goldschmidt
   * sockets.c: Fixed bug #31590: getsockopt(... SO_ERROR ...) gives EINPROGRESS
     after a successful nonblocking connection.

src/include/lwip/err.h

@@ -58,7 +58,7 @@ typedef s8_t err_t;
 #define ERR_VAL        -6    /* Illegal value.           */
 #define ERR_WOULDBLOCK -7    /* Operation would block.   */
 
-#define ERR_IS_FATAL(e) ((e) < ERR_VAL)
+#define ERR_IS_FATAL(e) ((e) < ERR_WOULDBLOCK)
 
 #define ERR_ABRT       -8    /* Connection aborted.      */
 #define ERR_RST        -9    /* Connection reset.        */