fix: apply suggestions from code review

Signed-off-by: Muhammad Haris <101793258+headlessNode@users.noreply.github.com>

Author: headlessNode

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

@@ -78,13 +78,7 @@ function dediff( N, x, strideX, offsetX, N1, prepend, strideP, offsetP, N2, appe
 
 	// Compute differences of input array:
 	ix = offsetX;
-	if ( strideOut > 1 ) {
-		io = ( offsetOut + N1 ) + strideOut;
-	} else if ( strideOut < 0 ) {
-		io = ( offsetOut - N1 ) + strideOut;
-	} else {
-		io = offsetOut + N1;
-	}
+	io = offsetOut + ( N1 * strideOut );
 	prev = x[ ix ];
 	for ( i = 1; i < N; i++ ) {
 		ix += strideX;