fix crash if negative monitor (< -1) was passed

for example: dmenu -m '-9001'

1 files changed, 2 insertions, 2 deletions

diff --git a/dmenu.c b/dmenu.c
index 8e84fbd..df51e76 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -541,7 +541,7 @@ setup(void)
 #ifdef XINERAMA
         if ((info = XineramaQueryScreens(dpy, &n))) {
                 XGetInputFocus(dpy, &w, &di);
-                if (mon != -1 && mon < n)
+                if (mon >= 0 && mon < n)
                         i = mon;
                 else if (w != root && w != PointerRoot && w != None) {
                         /* find top-level window containing current input focus */
@@ -558,7 +558,7 @@ setup(void)
                                         }
                 }
                 /* no focused window is on screen, so use pointer location instead */
-                if (mon == -1 && !area && XQueryPointer(dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
+                if (mon < 0 && !area && XQueryPointer(dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
                         for (i = 0; i < n; i++)
                                 if (INTERSECT(x, y, 1, 1, info[i]))
                                         break;