CLEANUP: Fix typo in the fwrr subsystem

Fixes a typo in the code comment of the fwrr subsystem.
diff --git a/src/lb_fwrr.c b/src/lb_fwrr.c
index 73a140b..3532279 100644
--- a/src/lb_fwrr.c
+++ b/src/lb_fwrr.c
@@ -586,7 +586,7 @@
 
  requeue_servers:
 	/* Requeue all extracted servers. If full==srv then it was
-	 * avoided (unsucessfully) and chained, omit it now.
+	 * avoided (unsuccessfully) and chained, omit it now.
 	 */
 	if (unlikely(full != NULL)) {
 		if (switched) {