um: ptrace-generic.h doesn't need user.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/include/asm/ptrace-generic.h

@@ -9,7 +9,6 @@
 #ifndef __ASSEMBLY__
 
 #include <asm/ptrace-abi.h>
-#include <asm/user.h>
 #include "sysdep/ptrace.h"
 
 struct pt_regs {