refactor: inline expression rather than create intermediate variable

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/every-by/lib/main.js

@@ -179,7 +179,6 @@ function everyBy( arrays, predicate, thisArg ) {
 	var ndims;
 	var shx;
 	var iox;
-	var len;
 	var x;
 
 	// Unpack the ndarray and standardize ndarray meta data:
@@ -194,11 +193,8 @@ function everyBy( arrays, predicate, thisArg ) {
 		}
 		return EVERY[ ndims ]( x, predicate, thisArg );
 	}
-	// Compute the number of elements:
-	len = numel( shx );
-
 	// Check whether we were provided an empty ndarray...
-	if ( len === 0 ) {
+	if ( numel( shx ) === 0 ) {
 		return true;
 	}
 	// Determine whether the ndarray is one-dimensional and thus readily translates to a one-dimensional strided array...