uml: tls code - style cleanup

From: Jeff Dike <jdike@addtoit.com>

The _syscall* macros are really defined in linux/unistd.h, not asm/unistd.h.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Index: linux-2.6.15/arch/um/os-Linux/tls.c
===================================================================
--- linux-2.6.15.orig/arch/um/os-Linux/tls.c
+++ linux-2.6.15/arch/um/os-Linux/tls.c
@@ -46,7 +46,7 @@ int os_get_thread_area(user_desc_t *info
 #endif
 
 #ifdef UML_CONFIG_MODE_TT
-#include "asm/unistd.h"
+#include "linux/unistd.h"
 
 _syscall1(int, get_thread_area, user_desc_t *, u_info);
 _syscall1(int, set_thread_area, user_desc_t *, u_info);
