Fix identifier

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/bytes-per-element/benchmark/c/benchmark.c

@@ -109,7 +109,7 @@ double benchmark() {
 		STDLIB_NDARRAY_FLOAT32,
 		STDLIB_NDARRAY_FLOAT64
 	};
-	enum STDLIB_NDARRAY_DTYPES dtype;
+	enum STDLIB_NDARRAY_DTYPE dtype;
 
 	t = tic();
 	for ( i = 0; i < ITERATIONS; i++ ) {