fix: apply suggestions from code review

Author: headlessNode

lib/node_modules/@stdlib/ndarray/base/diagonal/lib/main.js

@@ -106,16 +106,16 @@ function diagonal( x, dims, k, writable ) {
 	co = ( k > 0 ) ? k : 0;
 	ro = co - k;
 
-	// Compute the length of the diagonal (clamped to be non-negative):
+	// Compute the length of the diagonal:
 	rows = sh[ d[0] ] - ro;
 	cols = sh[ d[1] ] - co;
 	L = min( rows, cols );
+
+	// Adjust the offset so that we point to the first element along the specified diagonal (otherwise, the diagonal is empty and the offset remains at the buffer base):
+	offset = getOffset( x );
 	if ( L < 0 ) {
 		L = 0;
-	}
-	// Adjust the offset so that we point to the first element along the specified diagonal:
-	offset = getOffset( x );
-	if ( L > 0 ) {
+	} else {
 		offset += ( co*sc ) + ( ro*sr );
 	}