um: get rid of pointless include "..." where include <...> will do

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/drivers/pty.c b/arch/um/drivers/pty.c
index cff2b75..f1fcc2c 100644
--- a/arch/um/drivers/pty.c
+++ b/arch/um/drivers/pty.c
@@ -12,8 +12,8 @@
 #include <termios.h>
 #include <sys/stat.h>
 #include "chan_user.h"
-#include "os.h"
-#include "um_malloc.h"
+#include <os.h>
+#include <um_malloc.h>
 
 struct pty_chan {
 	void (*announce)(char *dev_name, int dev);