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/sys-ppc/ptrace.c b/arch/um/sys-ppc/ptrace.c
index 66ef155..8245df4 100644
--- a/arch/um/sys-ppc/ptrace.c
+++ b/arch/um/sys-ppc/ptrace.c
@@ -1,4 +1,4 @@
-#include "linux/sched.h"
+#include <linux/sched.h>
 #include "asm/ptrace.h"
 
 int putreg(struct task_struct *child, unsigned long regno,