Only build debug infrastructure if DEBUG is defined

It's only used when DEBUG is defined, so don't build it when
we're not using it.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/listing.c b/listing.c
index 663c652..3db66f8 100644
--- a/listing.c
+++ b/listing.c
@@ -123,7 +123,9 @@ SOFTWARE.
 
 #define	lowbit(x)	((x) & (-(x)))
 
+#ifdef DEBUG
 unsigned int listingDebug;
+#endif
 
 static int szListing = 0;
 static int nListed = 0;