style: fix lint error

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: nasarobot

lib/node_modules/@stdlib/stats/incr/nanmmda/lib/main.js

@@ -73,10 +73,7 @@ function incrnanmmda( W ) {
 	* @returns {(number|null)} mean directional accuracy or null
 	*/
 	function accumulator( f, a ) {
-		if ( arguments.length === 0 ) {
-			return mmda();
-		}
-		if ( isnan( f ) || isnan( a ) ) {
+		if ( arguments.length === 0 || isnan( f ) || isnan( a ) ) {
 			return mmda();
 		}
 		return mmda( f, a );