bench: refactor to use dynamic memory allocation in blas/ext/base/dnancusumkbn

Replace Static Memory Allocation with Dynamic Memory Allocation

---
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: na
  - 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: passed
  - 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: SijanBhandari17

lib/node_modules/@stdlib/blas/ext/base/dnancusumkbn/benchmark/c/benchmark.length.c

@@ -96,11 +96,14 @@ static double rand_double( void ) {
 */
 static double benchmark1( int iterations, int len ) {
 	double elapsed;
-	double x[ len ];
-	double y[ len ];
+	double *x;
+	double *y;
 	double t;
 	int i;
 
+
+	x = (double *)malloc(len * sizeof(double));
+	y = (double *)malloc(len * sizeof(double));
 	for ( i = 0; i < len; i++ ) {
 		if ( rand_double() < 0.2 ) {
 			x[ i ] = 0.0 / 0.0; // NaN
@@ -122,23 +125,27 @@ static double benchmark1( int iterations, int len ) {
 	if ( y[ len-1 ] != y[ len-1 ] ) {
 		printf( "should not return NaN\n" );
 	}
+	free(x);
+	free(y);
 	return elapsed;
 }
 
 /**
-* Runs a benchmark.
-*
-* @param iterations   number of iterations
-* @param len          array length
-* @return             elapsed time in seconds
-*/
+ * Runs a benchmark.
+ *
+ * @param iterations   number of iterations
+ * @param len          array length
+ * @return             elapsed time in seconds
+ */
 static double benchmark2( int iterations, int len ) {
 	double elapsed;
-	double x[ len ];
-	double y[ len ];
+	double *x;
+	double *y;
 	double t;
 	int i;
 
+	x = (double *)malloc(len * sizeof(double));
+	y = (double *)malloc(len * sizeof(double));
 	for ( i = 0; i < len; i++ ) {
 		if ( rand_double() < 0.2 ) {
 			x[ i ] = 0.0 / 0.0; // NaN
@@ -160,12 +167,14 @@ static double benchmark2( int iterations, int len ) {
 	if ( y[ len-1 ] != y[ len-1 ] ) {
 		printf( "should not return NaN\n" );
 	}
+	free(x);
+	free(y);
 	return elapsed;
 }
 
 /**
-* Main execution sequence.
-*/
+ * Main execution sequence.
+ */
 int main( void ) {
 	double elapsed;
 	int count;