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/slirp_kern.c b/arch/um/drivers/slirp_kern.c
index e376284..4ef11ca 100644
--- a/arch/um/drivers/slirp_kern.c
+++ b/arch/um/drivers/slirp_kern.c
@@ -4,11 +4,11 @@
  */
 
 #include <linux/if_arp.h>
-#include "linux/init.h"
+#include <linux/init.h>
 #include <linux/netdevice.h>
 #include <linux/string.h>
-#include "net_kern.h"
-#include "net_user.h"
+#include <net_kern.h>
+#include <net_user.h>
 #include "slirp.h"
 
 struct slirp_init {