Fix some shellcheck linter warnings

* admin/diff-tar-files:
* admin/merge-gnulib:
* admin/merge-pkg-config:
* admin/update-copyright:
* build-aux/git-hooks/prepare-commit-msg:
* make-dist: Fix some shellcheck linter warnings.

1 files changed, 2 insertions, 2 deletions

diff --git a/build-aux/git-hooks/prepare-commit-msg b/build-aux/git-hooks/prepare-commit-msg
index dbb1264b495..06e328a1c39 100755
--- a/build-aux/git-hooks/prepare-commit-msg
+++ b/build-aux/git-hooks/prepare-commit-msg
@@ -24,9 +24,9 @@ SHA1=$3
 
 # Prefer gawk if available, as it handles NUL bytes properly.
 if type gawk >/dev/null 2>&1; then
-  awk=gawk
+  awk="gawk"
 else
-  awk=awk
+  awk="awk"
 fi
 
 exec $awk '