squash a -Wsign-conversion warning

diff --git a/plugin/core/gvrender_core_fig.c b/plugin/core/gvrender_core_fig.c
index b68364cecfbc26a42811b8be889b89258da64f23..7c946c7820018b45c6748c5cbb7ebe2b6081bd27 100644 (file)
--- a/plugin/core/gvrender_core_fig.c
+++ b/plugin/core/gvrender_core_fig.c
@@ -55,8 +55,8 @@ static void figptarray(GVJ_t *job, pointf * A, int n, int close)
 static char *fig_string(char *s)
 {
     static char *buf = NULL;
-    static int bufsize = 0;
-    int pos = 0;
+    static size_t bufsize = 0;
+    size_t pos = 0;
     char *p;
     unsigned char c;