imap-send: cleanup execl() call to use NULL sentinel instead of 0

Some versions of gcc check that calls to the exec() family have the proper
sentinel for variadic calls. This should be (char *) NULL according to the
man page. Although for all other purposes the 0 is equivalent, gcc
nevertheless does emit a warning for 0 and not for NULL. This also makes the
usage consistent throughout git.

The whitespace in function calls throughout imap-send.c has its own style,
so I left it that way.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/imap-send.c b/imap-send.c
index fddaac0..203284d 100644 (file)
--- a/imap-send.c
+++ b/imap-send.c
@@ -945,7 +945,7 @@ imap_open_store( imap_server_conf_t *srvc )
                                _exit( 127 );
                        close( a[0] );
                        close( a[1] );
-                       execl( "/bin/sh", "sh", "-c", srvc->tunnel, 0 );
+                       execl( "/bin/sh", "sh", "-c", srvc->tunnel, NULL );
                        _exit( 127 );
                }