git: df.1: Fix example for -t. It's null, not nullfs.

[Sascha Wildner]

commit 95c13657381b723af78c6a5fdedff66248f62f97
Author: Sascha Wildner <saw at online.de>
Date:   Fri Mar 17 21:32:57 2017 +0100

    df.1: Fix example for -t. It's null, not nullfs.
    
    Reported-by: marino

Summary of changes:
 bin/df/df.1 | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/95c13657381b723af78c6a5fdedff66248f62f97


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