refactor: break out of loop early

---
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---

Author: headlessNode

lib/node_modules/@stdlib/string/base/slice-code-points/lib/main.js

@@ -77,7 +77,7 @@ function sliceCodePoints( str, start, end ) {
 	idx = 0;
 
 	// Process the string one Unicode code unit at a time and handle UTF-16 surrogate pairs as a single Unicode code point...
-	for ( i = 0; i < len; i++ ) {
+	for ( i = 0; i < len && idx < end; i++ ) {
 		ch1 = str[ i ];
 		ch = ch1;