Update benchmark.length.c

Signed-off-by: JavaTypedScript <[email protected]>

Author: JavaTypedScript

lib/node_modules/@stdlib/stats/base/smeanors/benchmark/c/benchmark.length.c

@@ -96,7 +96,7 @@ static float rand_float( void ) {
 */
 static double benchmark( int iterations, int len ) {
 	double elapsed;
-	float x[ len ];
+	double x[ len ];
 	float v;
 	double t;
 	int i;