growops: squash a -Wsign-conversion warning

By construction, `newopn` can only ever be non-negative here. Though in the long
term a more sweeping change should be done to count items in `size_t` variables
pervasively.

diff --git a/lib/pathplan/route.c b/lib/pathplan/route.c
index 69bb776fded24913d50035fdf8e8de1a0868a313..e42306a1cebb71220fb4bcf7e7ee57cfa251a16e 100644 (file)
--- a/lib/pathplan/route.c
+++ b/lib/pathplan/route.c
@@ -418,7 +418,7 @@ static int growops(int newopn)
 {
     if (newopn <= opn)
        return 0;
-    if (!(ops = realloc(ops, POINTSIZE * newopn))) {
+    if (!(ops = realloc(ops, POINTSIZE * (size_t)newopn))) {
        return -1;
     }
     opn = newopn;