btrfs-progs: ioctl: fix compilation if ioctl.h is included standalone
authorDavid Sterba <dsterba@suse.com>
Mon, 14 Nov 2016 15:43:15 +0000 (16:43 +0100)
committerDavid Sterba <dsterba@suse.com>
Wed, 23 Nov 2016 09:49:33 +0000 (10:49 +0100)
commit08a072c70998f89aef8f9704a16b52998a0a4d69
tree1b4a4599c061a9cf4c3e4070e531dffc58b81961
parentbecd520b5cc5a9cbb8ca70250c8ebf09bae28eb0
btrfs-progs: ioctl: fix compilation if ioctl.h is included standalone

Definition of NULL is missing if ioctl.h is included standalone or when
no other include pulls the definition.

Reported-by: Sergei Trofimovich <slyich@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
ioctl.h