Fixed uninitialized value warning.

I am now *very* impressed by GCC's flow analysis.

svn path=/trunk/; revision=46536

ui/gtk/follow_tcp.c

@@ -320,6 +320,7 @@ sgetline(char *str, int *next) {
 
   end = strstr(str, "\r\n");
   if (!end) {
+    *next = strlen(str);
     return NULL;
   }
   *end = '\0';