chore: fix C lint errors (issue #6475)

lib/node_modules/@stdlib/strided/base/dmap/benchmark/c/benchmark.length.c

@@ -104,30 +104,47 @@ static double identity( const double x ) {
 * @param len          array length
 * @return             elapsed time in seconds
 */
-static double benchmark( int iterations, int len ) {
-	double elapsed;
-	double x[ len ];
-	double y[ len ];
-	double t;
-	int i;
-
-	for ( i = 0; i < len; i++ ) {
-		x[ i ] = ( rand_double()*200.0 ) - 100.0;
-		y[ i ] = 0.0;
-	}
-	t = tic();
-	for ( i = 0; i < iterations; i++ ) {
-		stdlib_strided_dmap( len, x, 1, y, 1, identity );
-		if ( y[ i%len ] != y[ i%len ] ) {
-			printf( "should not return NaN\n" );
-			break;
-		}
-	}
-	elapsed = tic() - t;
-	if ( y[ i%len ] != y[ i%len ] ) {
-		printf( "should not return NaN\n" );
-	}
-	return elapsed;
+static double benchmark(int iterations, int len) {
+    // Initialize all variables at declaration
+    double elapsed = 0.0;
+    double *x = malloc(len * sizeof(double));  // Use dynamic allocation instead of VLA
+    double *y = malloc(len * sizeof(double));
+    double t = 0.0;
+    int i = 0;
+
+    // Check if memory allocation was successful
+    if (x == NULL || y == NULL) {
+        // Handle allocation failure
+        free(x);
+        free(y);
+        return -1.0;
+    }
+
+    // Initialize arrays
+    for (i = 0; i < len; i++) {
+        x[i] = (rand_double() * 200.0) - 100.0;
+        y[i] = 0.0;
+    }
+
+    t = tic();
+    for (i = 0; i < iterations; i++) {
+        stdlib_strided_dmap(len, x, 1, y, 1, identity);
+        if (y[i % len] != y[i % len]) {
+            printf("should not return NaN\n");
+            break;
+        }
+    }
+    elapsed = tic() - t;
+
+    if (y[i % len] != y[i % len]) {
+        printf("should not return NaN\n");
+    }
+
+    // Free allocated memory
+    free(x);
+    free(y);
+
+    return elapsed;
 }
 
 /**