Fix broken ButtonMapping option (#53168)

Regression introduced in 8af0e6f1ebaf327f735bca507134b34bb24b26c6.
s is now initialized to NULL, so we never entered the loop.

X.Org Bug 53168 <http://bugs.freedesktop.org/show_bug.cgi?id=53168>

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 33e7831b5fabc5c9dcc0224800a04761086952a7)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/evdev.c b/src/evdev.c
index 6729f23..54772c7 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -1665,7 +1665,7 @@ EvdevInitButtonMapping(InputInfoPtr pInfo)
 
         xf86IDrvMsg(pInfo, X_CONFIG, "ButtonMapping '%s'\n", mapping);
         map = mapping;
-        while (s && *s != '\0' && nbuttons < EVDEV_MAXBUTTONS)
+        do
         {
             btn = strtol(map, &s, 10);
 
@@ -1679,7 +1679,7 @@ EvdevInitButtonMapping(InputInfoPtr pInfo)
 
             pEvdev->btnmap[nbuttons++] = btn;
             map = s;
-        }
+        } while (s && *s != '\0' && nbuttons < EVDEV_MAXBUTTONS);
         free(mapping);
     }