patch 8.2.2768: Vim9: memory leak with blob range error

Problem:    Vim9: memory leak with blob range error.
Solution:   Jump to end instead of returning.
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 6286114..78c387f 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -6474,7 +6474,7 @@
 			    {
 				semsg(_(e_cannot_use_range_with_assignment_operator_str),
 								    var_start);
-				return FAIL;
+				goto theend;
 			    }
 
 			    // Get the member.