fix: apply suggestions from code review

Signed-off-by: Muhammad Haris <101793258+headlessNode@users.noreply.github.com>

Author: headlessNode

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

@@ -98,10 +98,10 @@ static double rand_double( void ) {
 */
 static double benchmark1( int iterations, int len ) {
 	bool *condition;
+	double elapsed;
 	double *out;
 	double *x;
 	double *y;
-	double elapsed;
 	double t;
 	int i;