Make condition simpler

src/useMergedRefs.ts

@@ -19,7 +19,7 @@ export const useMergedRefs = <T>(
       refs.forEach((ref) => {
         if (typeof ref === "function") {
           ref(value);
-        } else if (ref != null) {
+        } else if (ref) {
           ref.current = value;
         }
       }),