fix: fixing c benchmark

Author: Vinit-Pandit

lib/node_modules/@stdlib/stats/base/dists/rayleigh/logpdf/benchmark/c/benchmark.c

@@ -95,19 +95,19 @@ static double random_uniform( const double min, const double max ) {
 static double benchmark( void ) {
 	double elapsed;
 	double x[ 100 ];
-	double sigma;
+	double sigma[ 100 ];
 	double y;
 	double t;
 	int i;
 
-	sigma = 4.0;
 	for ( i = 0; i < 100; i++ ) {
-		x[ i ] = random_uniform( 0.0, 25.0 );
+		x[ i ] = random_uniform( 20, 20 + STDLIB_CONSTANT_FLOAT64_EPS );
+		sigma[ i ] = random_uniform( -100, 0 );
 	}
 
 	t = tic();
 	for ( i = 0; i < ITERATIONS; i++ ) {
-		y = stdlib_base_dists_rayleigh_logpdf( x[ i%100 ], sigma );
+		y = stdlib_base_dists_rayleigh_logpdf( x[ i % 100 ], sigma[ i % 100 ] );
 		if ( y != y ) {
 			printf( "should not return NaN\n" );
 			break;