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/port_user.c b/arch/um/drivers/port_user.c
index 7b010b7..9a8e1b6 100644
--- a/arch/um/drivers/port_user.c
+++ b/arch/um/drivers/port_user.c
@@ -10,9 +10,9 @@
 #include <unistd.h>
 #include <netinet/in.h>
 #include "chan_user.h"
-#include "os.h"
+#include <os.h>
 #include "port.h"
-#include "um_malloc.h"
+#include <um_malloc.h>
 
 struct port_chan {
 	int raw;