Fix error checking

https://github.com/rqlite/rqlite/pull/1317#discussion_r1286866112

db/db.go

@@ -287,7 +287,7 @@ func ReplayWAL(path string, wals []string, deleteMode bool) error {
 		if err != nil {
 			return err
 		}
-		if db.Close(); err != nil {
+		if err := db.Close(); err != nil {
 			return err
 		}
 	}