Fix Issues reported by PVS-Studio static analyzer

* vm.c (vm_set_main_stack): remove unnecessary check.  toplevel
  binding must be initialized.  [Bug #12611] (N1)
* win32/win32.c (w32_symlink): fix return type.  [Bug #12611] (N3)
* string.c (rb_str_split_m): simplify the condition.
  [Bug #12611](N4)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/string.c b/string.c
index 5b5f69a60a..4a24e5d67c 100644
--- a/string.c
+++ b/string.c
@@ -7235,7 +7235,7 @@ rb_str_split_m(int argc, VALUE *argv, VALUE str)
 		    beg = start;
 		}
 		else {
-                    if (ptr+start == ptr+len)
+                    if (start == len)
                         start++;
                     else
                         start += rb_enc_fast_mbclen(ptr+start,ptr+len,enc);