Apply suggestions from code review

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

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/dnansumors/lib/ndarray.js

@@ -47,11 +47,11 @@ function dnansumors( N, x, strideX, offsetX ) {
 	var ix;
 	var i;
 
-	ix = offsetX;
 	sum = 0.0;
 	if ( N <= 0 ) {
 		return sum;
 	}
+	ix = offsetX;
 	if ( strideX === 0 ) {
 		if ( isnan( x[ ix ] ) ) {
 			return sum;