bench: fix types in C benchmarks

PR-URL: #7864
Reviewed-by: Athan Reines <[email protected]>

Author: gunjjoshi

lib/node_modules/@stdlib/number/uint32/base/mul/benchmark/c/benchmark.c

@@ -101,7 +101,7 @@ static uint32_t mul( const uint32_t x, const uint32_t y ) {
 static double benchmark( void ) {
 	uint32_t x[ 100 ];
 	double elapsed;
-	double y;
+	uint32_t y;
 	double t;
 	int i;
 

lib/node_modules/@stdlib/number/uint32/base/mul/benchmark/c/native/benchmark.c

@@ -93,7 +93,7 @@ static double rand_double( void ) {
 static double benchmark( void ) {
 	uint32_t x[ 100 ];
 	double elapsed;
-	double y;
+	uint32_t y;
 	double t;
 	int i;