fix: apply code review suggestion

Author: headlessNode

lib/node_modules/@stdlib/blas/ext/base/dnansumkbn2/lib/ndarray.js

@@ -62,13 +62,13 @@ function dnansumkbn2( N, x, strideX, offsetX ) {
 	var c;
 	var i;
 
-	ix = offsetX;
 	sum = 0.0;
 	ccs = 0.0; // second order correction term for lost low order bits
 	cs = 0.0; // first order correction term for lost low order bits
 	if ( N <= 0 ) {
 		return 0.0;
 	}
+	ix = offsetX;
 	if ( strideX === 0 ) {
 		if ( isnan( x[ ix ] ) ) {
 			return sum;

lib/node_modules/@stdlib/blas/ext/base/dnansumkbn2/src/main.c

@@ -71,13 +71,13 @@ double API_SUFFIX(stdlib_strided_dnansumkbn2_ndarray)( const CBLAS_INT N, const
 	double t;
 	double c;
 
-	ix = offsetX;
 	sum = 0.0;
 	ccs = 0.0; // second order correction term for lost lower order bits
 	cs = 0.0; // first order correction term for lost low order bits
 	if ( N <= 0 ) {
 		return sum;
 	}
+	ix = offsetX;
 	if ( strideX == 0 ) {
 		if ( stdlib_base_is_nan( X[ ix ] ) ) {
 			return sum;