fix: use correct return value

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---

Author: kgryte

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

@@ -82,7 +82,7 @@ function dnansumkbn2( N, x, strideX, offsetX ) {
 		ix += strideX;
 	}
 	if ( i === N ) {
-		return NaN;
+		return 0.0;
 	}
 	sum = v;
 	ix += strideX;