linux-user: Fix broken header guard in syscall_defs.h

Found with scripts/clean-header-guards.pl.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index dce1bcc..b43966e 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -5,8 +5,7 @@
    necessary */
 
 #ifndef SYSCALL_DEFS_H
-#define SYSCALL_DEFS_H 1
-
+#define SYSCALL_DEFS_H
 
 #include "syscall_nr.h"
 
@@ -2577,8 +2576,6 @@
     uint32_t gid;
 };
 
-#endif
-
 typedef int32_t target_timer_t;
 
 #define TARGET_SIGEV_MAX_SIZE 64
@@ -2620,3 +2617,5 @@
     uint32_t permitted;
     uint32_t inheritable;
 };
+
+#endif