(lnd_fortify): The previous revision could break under conditions that

currently don't occur.  Fix anyway.

diff --git a/src/lib/subs/lndsub.c b/src/lib/subs/lndsub.c
index ee80d4629c89fbbd8f3844b2955d6b8fda8ec18a..2384633f34b3867df40eccaeb2d68c6c5813f152 100644 (file)
--- a/src/lib/subs/lndsub.c
+++ b/src/lib/subs/lndsub.c
@@ -1322,6 +1322,9 @@ lnd_fortify(struct lndstr *lp, int mob)
        return 0;
 
     mob_used = MIN(lp->lnd_mobil, mob);
+    if (mob_used < 0)
+       return 0;
+
     mult = has_helpful_engineer(lp->lnd_x, lp->lnd_y, lp->lnd_own)
        ? 1.5 : 1.0;