Fix http://forums.duke4.net/index.php?s=&showtopic=2961&view=findpost&p=60758

git-svn-id: https://svn.eduke32.com/eduke32@1825 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/source/gamedef.c

@@ -1521,6 +1521,9 @@ static int32_t C_GetKeyword(void)
 
     C_SkipComments();
 
+    if (*textptr == '\0') // EOF
+        return 0;
+
     temptextptr = textptr;
 
     while (isaltok(*temptextptr) == 0)