gv2gxl writeHdr: use 'size_t' to track buffer size

Squashes -Wconversion warnings.

diff --git a/cmd/tools/gv2gxl.c b/cmd/tools/gv2gxl.c
index 95271d478c1a7c037bb3332af7dcd817cf159183..5ec7b519068d4f4101b9fca7030898d69deadd40 100644 (file)
--- a/cmd/tools/gv2gxl.c
+++ b/cmd/tools/gv2gxl.c
@@ -506,7 +506,7 @@ writeHdr(gxlstate_t * stp, Agraph_t * g, FILE * gxlFile, int top)
     char buf[BUFSIZ];
     char *bp;
     char *dynbuf = 0;
-    int len;
+    size_t len;
 
     Level++;
     stp->attrsNotWritten = AGATTRWF(g);