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/os-Linux/drivers/etap.h b/arch/um/os-Linux/drivers/etap.h
index ddffd41..54183a6 100644
--- a/arch/um/os-Linux/drivers/etap.h
+++ b/arch/um/os-Linux/drivers/etap.h
@@ -6,7 +6,7 @@
 #ifndef __DRIVERS_ETAP_H
 #define __DRIVERS_ETAP_H
 
-#include "net_user.h"
+#include <net_user.h>
 
 struct ethertap_data {
 	char *dev_name;