fix: fix the linting 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: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Lokeshranjan8

lib/node_modules/@stdlib/stats/base/dists/erlang/cdf/lib/main.js

@@ -79,7 +79,10 @@ var gammaCDF = require( '@stdlib/stats/base/dists/gamma/cdf' );
 * // returns NaN
 */
 function cdf( x, k, lambda ) {
-	if ( !isNonNegativeInteger( k ) ) {
+	if (
+		!isNonNegativeInteger( k ) ||
+		k <= 0
+	) {
 		return NaN;
 	}
 	return gammaCDF( x, k, lambda );