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/umcast_kern.c b/arch/um/drivers/umcast_kern.c
index 42dab11..f5ba6e3 100644
--- a/arch/um/drivers/umcast_kern.c
+++ b/arch/um/drivers/umcast_kern.c
@@ -11,10 +11,10 @@
  * Licensed under the GPL.
  */
 
-#include "linux/init.h"
+#include <linux/init.h>
 #include <linux/netdevice.h>
 #include "umcast.h"
-#include "net_kern.h"
+#include <net_kern.h>
 
 struct umcast_init {
 	char *addr;