[Toybox] df not working on FreeBSD

[Vidar Karlsen]

Hello,

df throws the following error on FreeBSD:

root at 140amd64_noopts-usrports:/usr/local/toybox/bin # ./df /
df: getmntinfo: Invalid argument

A little bit of poking around shows that getmntinfo expects the second
argument (the mode) to be one of these, and not 0:

sys/sys/mount.h:
#define MNT_WAIT    1   /* synchronously wait for I/O to complete */
#define MNT_NOWAIT  2   /* start all I/O, but do not wait for it */
#define MNT_LAZY    3   /* push data not written by filesystem syncer */
#define MNT_SUSPEND 4   /* Suspend file system after sync */

Changing 0 to MNT_NOWAIT in portability.c makes df happy again.
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