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/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index c0ef803..62145c2 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -18,7 +18,7 @@
 #include <linux/mm.h>
 
 #include <asm/uaccess.h>
-#include "mem_user.h"
+#include <mem_user.h>
 
 /* These are set in mmapper_init, which is called at boot time */
 static unsigned long mmapper_size;