git-extra: fix quoting in post-install script

This slipped by, somehow, even during the manual test of 257a670
(git-extra: really only add the aarch64 repository for git-sdk-arm64,
2023-02-11)...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

git-extra/git-extra.install

@@ -120,7 +120,7 @@ GITATTRIBUTES
 	grep -q "$otherpacman" etc/pacman.conf ||
 	sed -i -e '/^\[mingw32\]/i['$otherpacman']\nServer = https://wingit.blob.core.windows.net/'$otherarch'\n' etc/pacman.conf
 
-	test -z "$(find /clangarm64 -type f -print -quit) || # if /clangarm64 exists and contains at least one file
+	test -z "$(find /clangarm64 -type f -print -quit)" || # if /clangarm64 exists and contains at least one file
 	grep -q "git-for-windows-aarch64" etc/pacman.conf || # then add Git for Windows' aarch64 repository (unless it's already added)
 	sed -i -e '/^\[clangarm64]/i[git-for-windows-aarch64]\nServer = https://wingit.blob.core.windows.net/aarch64\n' etc/pacman.conf
 

git-extra/git-extra.install.in

@@ -86,7 +86,7 @@ GITATTRIBUTES
 	grep -q "$otherpacman" etc/pacman.conf ||
 	sed -i -e '/^\[mingw32\]/i['$otherpacman']\nServer = https://wingit.blob.core.windows.net/'$otherarch'\n' etc/pacman.conf
 
-	test -z "$(find /clangarm64 -type f -print -quit) || # if /clangarm64 exists and contains at least one file
+	test -z "$(find /clangarm64 -type f -print -quit)" || # if /clangarm64 exists and contains at least one file
 	grep -q "git-for-windows-aarch64" etc/pacman.conf || # then add Git for Windows' aarch64 repository (unless it's already added)
 	sed -i -e '/^\[clangarm64]/i[git-for-windows-aarch64]\nServer = https://wingit.blob.core.windows.net/aarch64\n' etc/pacman.conf