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/fs/select.c b/fs/select.c
index 5633fe9..00f58c5 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -260,7 +260,7 @@
 		wait = NULL;
 		if (retval || !*timeout || signal_pending(current))
 			break;
-		if(table.error) {
+		if (table.error) {
 			retval = table.error;
 			break;
 		}