Fix build with FIO_INC_DEBUG not included

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/debug.h b/debug.h
index 160f48c..a9e9e93 100644
--- a/debug.h
+++ b/debug.h
@@ -18,6 +18,8 @@
 	FD_DEBUG_MAX,
 };
 
+extern unsigned int fio_debug_jobno, *fio_debug_jobp;
+
 #ifdef FIO_INC_DEBUG
 struct debug_level {
 	const char *name;
@@ -27,7 +29,6 @@
 extern struct debug_level debug_levels[];
 
 extern unsigned long fio_debug;
-extern unsigned int fio_debug_jobno, *fio_debug_jobp;
 
 #define dprint(type, str, args...)				\
 	do {							\
diff --git a/init.c b/init.c
index 00eb592..71fe4be 100644
--- a/init.c
+++ b/init.c
@@ -916,7 +916,7 @@
 	return 0;
 }
 #else
-static void set_debug(const char *string)
+static int set_debug(const char *string)
 {
 	log_err("fio: debug tracing not included in build\n");
 	return 1;