Fixes a bunch of warnings of the kind
../src/evdev.h:378:32: warning: variable 'f' is uninitialized when used here 
[-Wuninitialized]
        return container_of(dispatch, f, base);

Just typecasting NULL means we can ignore sample but for the type.

https://bugs.freedesktop.org/show_bug.cgi?id=100976

Signed-off-by: Peter Hutterer <[email protected]>
---
 src/libinput-util.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libinput-util.h b/src/libinput-util.h
index a9a2b660..9ecded7e 100644
--- a/src/libinput-util.h
+++ b/src/libinput-util.h
@@ -87,7 +87,7 @@ bool list_empty(const struct list *list);
 
 #define container_of(ptr, sample, member)                              \
        (__typeof__(sample))((char *)(ptr)      -                       \
-                ((char *)&(sample)->member - (char *)(sample)))
+                ((char *)&((typeof(sample))0)->member))
 
 #define list_for_each(pos, head, member)                               \
        for (pos = 0, pos = container_of((head)->next, pos, member);    \
-- 
2.12.2

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