exec: proc_exec_connector() should be called only once

A separate one-liner with the minor fix.

PROC_EVENT_EXEC reports the "exec" event, but this message is sent at
least twice if search_binary_handler() is called by ->load_binary()
recursively, say, load_script().

Move it to exec_binprm(), this is "depth == 0" code too.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Zach Levis <zml@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/exec.c

@@ -1404,7 +1404,6 @@ int search_binary_handler(struct linux_binprm *bprm)
 				if (bprm->file)
 					fput(bprm->file);
 				bprm->file = NULL;
-				proc_exec_connector(current);
 				return retval;
 			}
 			read_lock(&binfmt_lock);
@@ -1455,6 +1454,7 @@ static int exec_binprm(struct linux_binprm *bprm)
 		trace_sched_process_exec(current, old_pid, bprm);
 		ptrace_event(PTRACE_EVENT_EXEC, old_vpid);
 		current->did_exec = 1;
+		proc_exec_connector(current);
 	}
 
 	return ret;