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/kernel/ksyms.c b/arch/um/kernel/ksyms.c
index e17bea0..543c047 100644
--- a/arch/um/kernel/ksyms.c
+++ b/arch/um/kernel/ksyms.c
@@ -4,7 +4,7 @@
  */
 
 #include <linux/module.h>
-#include "os.h"
+#include <os.h>
 
 EXPORT_SYMBOL(set_signals);
 EXPORT_SYMBOL(get_signals);