Apply suggestions from code review

Co-authored-by: Athan <kgryte@gmail.com>
Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/sindex-of-row/benchmark/c/benchmark.length.c

@@ -96,7 +96,7 @@ static float rand_float( void ) {
 * @param N            number of elements along each dimension
 * @return             elapsed time in seconds
 */
-static float benchmark1( int iterations, int N ) {
+static double benchmark1( int iterations, int N ) {
 	uint8_t *workspace;
 	double elapsed;
 	float *A;
@@ -142,7 +142,7 @@ static float benchmark1( int iterations, int N ) {
 * @param N            number of elements along each dimension
 * @return             elapsed time in seconds
 */
-static float benchmark2( int iterations, int N ) {
+static double benchmark2( int iterations, int N ) {
 	uint8_t *workspace;
 	double elapsed;
 	float *A;