git: Fix one last -Wnonnull-compare in m4(1).

[Sascha Wildner]

commit d1a6d3e4858018aae1a8e1fcd05303ea3e1df819
Author: Sascha Wildner <saw at online.de>
Date:   Mon Jan 22 13:31:51 2018 +0100

    Fix one last -Wnonnull-compare in m4(1).

Summary of changes:
 usr.bin/m4/extern.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/d1a6d3e4858018aae1a8e1fcd05303ea3e1df819


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