trivial: small cleanups

These are small cleanups all over the tree.

Trivial style and comment changes to
  fs/select.c, kernel/signal.c, kernel/stop_machine.c & mm/pdflush.c

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 6f4e0e1..316283c 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -135,8 +135,7 @@
 	preempt_enable_no_resched();
 }
 
-struct stop_machine_data
-{
+struct stop_machine_data {
 	int (*fn)(void *);
 	void *data;
 	struct completion done;