chore: fix C lint errors

PR-URL: #7053
Closes: #6977
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: GeoDaoyu

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

@@ -107,6 +107,7 @@ static double benchmark( int iterations, int len ) {
 	v = 0.0f;
 	t = tic();
 	for ( i = 0; i < iterations; i++ ) {
+		// cppcheck-suppress uninitvar
 		v = stdlib_strided_snanvariance( len, 1.0f, x, 1 );
 		if ( v != v ) {
 			printf( "should not return NaN\n" );