git-gui: use git_read in githook_read

0730a5a ("git-gui - use git-hook, honor core.hooksPath", 2023-09-17)
rewrote githook_read to use `git hook` to run a hook script. The code
that was replaced discovered the hook script file manually and invoked
it using function _open_stdout_stderr. After the rewrite, this function
is still invoked, but it calls into `git` instead of the hook scripts.

Notice though, that we have function git_read that invokes git and
prepares a pipe for the caller to read from. Replace the implementation
of githook_read to be just a wrapper around git_read. This unifies the
way in which the git executable is invoked. git_read ultimately also
calls into _open_stdout_stderr, but it modifies the path to the git
executable before doing so.

Signed-off-by: Johannes Sixt <[email protected]>

Signed-off-by: Taylor Blau <[email protected]>

Author: j6t

git-gui.sh

@@ -669,8 +669,7 @@ proc git_write {args} {
 }
 
 proc githook_read {hook_name args} {
-	set cmd [concat git hook run --ignore-missing $hook_name -- $args 2>@1]
-	return [_open_stdout_stderr $cmd]
+	git_read hook run --ignore-missing $hook_name -- $args 2>@1
 }
 
 proc kill_file_process {fd} {