gvpr fwriteFile: squash a -Wsign-compare warning

diff --git a/lib/gvpr/actions.c b/lib/gvpr/actions.c
index 1c0b8fd0492f58341b527c835a56cab96552d05f..c7150834433e4fb267781617893e0aaa68d98c51 100644 (file)
--- a/lib/gvpr/actions.c
+++ b/lib/gvpr/actions.c
@@ -643,7 +643,8 @@ int fwriteFile(Expr_t * ex, Agraph_t * g, int fd, Agiodisc_t* io)
 {
     Sfio_t *sp;
 
-    if (fd < 0 || fd >= elementsof(ex->file)
+    if (fd < 0 ||
+        (elementsof(ex->file) <= INT_MAX && fd >= (int)elementsof(ex->file))
        || !((sp = ex->file[fd]))) {
        exerror("fwriteG: %d: invalid descriptor", fd);
        return 0;