DAOS-13785 gurt: protect d_log_refcount with d_log_lock (#12467) (#12474

)

Coverity fix for CID 1443180

Signed-off-by: Kenneth Cain <kenneth.c.cain@intel.com>

src/gurt/debug.c

@@ -560,9 +560,8 @@ d_log_init(void)
 
 void d_log_fini(void)
 {
-	D_ASSERT(d_log_refcount > 0);
-
 	D_MUTEX_LOCK(&d_log_lock);
+	D_ASSERT(d_log_refcount > 0);
 	d_log_refcount--;
 	if (d_log_refcount == 0) {
 		cleanup_dbg_namebit();