fix breakage when neither FFLUSH_ALL nor FFLUSH_NULL are #defined.

(Configure fflush(NULL) detection seems broken on Solaris, which
is why I hit the problem)

p4raw-id: //depot/perl@3439

1 files changed, 2 insertions, 0 deletions

diff --git a/perl.h b/perl.h
index e9eb909785..f075f3aa80 100644
--- a/perl.h
+++ b/perl.h
@@ -1466,6 +1466,8 @@ typedef pthread_key_t	perl_key;
 # else
 #  ifdef FFLUSH_ALL
 #   define PERL_FLUSHALL_FOR_CHILD	my_fflush_all()
+#  else
+#   define PERL_FLUSHALL_FOR_CHILD	(void)0
 #  endif
 # endif
 #endif