Fix compiler thinking tmpdir may be unitialised in emacsclient

This fixes the following warning:

	emacsclient.c: In function ‘set_local_socket’:
	/usr/include/x86_64-linux-gnu/bits/string3.h:111:3: error:
		‘tmpdir’ may be used uninitialized in this function
		[-Werror=maybe-uninitialized]
	   return __builtin___stpcpy_chk (__dest, __src, __bos (__dest));
	   ^
	emacsclient.c:1197:17: note: ‘tmpdir’ was declared here
	     const char *tmpdir;

* lib-src/emacsclient.c (set_local_socket): Get rid of use_tmpdir
variable and instead use tmpdir being non-NULL as sign that it should
be used.

1 files changed, 2 insertions, 4 deletions

diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 1991aaa9c02..458519d25fd 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -1191,10 +1191,9 @@ set_local_socket (const char *local_socket_name)
 
   {
     int sock_status;
-    int use_tmpdir = 0;
     int saved_errno;
     const char *server_name = local_socket_name;
-    const char *tmpdir;
+    const char *tmpdir = NULL;
     char *tmpdir_storage = NULL;
     char *socket_name_storage = NULL;
 
@@ -1202,7 +1201,6 @@ set_local_socket (const char *local_socket_name)
       {
         /* socket_name is a file name component.  */
         long uid = geteuid ();
-        use_tmpdir = 1;
         tmpdir = egetenv ("TMPDIR");
         if (!tmpdir)
           {
@@ -1240,7 +1238,7 @@ set_local_socket (const char *local_socket_name)
     /* See if the socket exists, and if it's owned by us. */
     sock_status = socket_status (server.sun_path);
     saved_errno = errno;
-    if (sock_status && use_tmpdir)
+    if (sock_status && tmpdir)
       {
         /* Failing that, see if LOGNAME or USER exist and differ from
            our euid.  If so, look for a socket based on the UID