xyOf: use size_t for string length

Squashes a -Wsign-conversion warning.

diff --git a/lib/gvpr/compile.c b/lib/gvpr/compile.c
index 9d0034bc48a549e9b3131fcd134fdb2934a686ca..716bdb2df8275840f2ed53be8c7f73fd91280093 100644 (file)
--- a/lib/gvpr/compile.c
+++ b/lib/gvpr/compile.c
@@ -143,12 +143,11 @@ static char *xyOf(Expr_t * pgm, char *pt, bool getx)
     double x, y;
     char *v;
     char *p;
-    int len;
 
     if (sscanf(pt, "%lf,%lf", &x, &y) == 2) {
        p = strchr(pt, ',');
        if (getx) {
-           len = p - pt;
+           size_t len = (size_t)(p - pt);
            v = exstralloc(pgm, len + 1);
            strncpy(v, pt, len);
            v[len] = '\0';