Followup to r15242 - as PRE() and POST() wrappers utilised, define with the *XY variant.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15245 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_syswrap/syswrap-darwin.c b/coregrind/m_syswrap/syswrap-darwin.c
index 1ce574e..28ddb1a 100644
--- a/coregrind/m_syswrap/syswrap-darwin.c
+++ b/coregrind/m_syswrap/syswrap-darwin.c
@@ -9498,7 +9498,7 @@
    _____(VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(129)),   // old truncate
    _____(VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(130)),   // old ftruncate
    GENX_(__NR_flock,       sys_flock), 
-   MACX_(__NR_mkfifo,      mkfifo),
+   MACXY(__NR_mkfifo,      mkfifo),
    MACX_(__NR_sendto,      sendto), 
    MACX_(__NR_shutdown,    shutdown), 
    MACXY(__NR_socketpair,  socketpair),