[newlib-cygwin] Cygwin: fix declaration of RtlInitEmptyUnicodeString

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=eeeb5650cf706f4dde72ce8b8598aef41f88718a

commit eeeb5650cf706f4dde72ce8b8598aef41f88718a
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Fri Sep 3 13:16:48 2021 +0200

    Cygwin: fix declaration of RtlInitEmptyUnicodeString
    
    This avoids "-Werror=maybe-uninitialized" errors due to
    using WCSTR accidentally.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/ntdll.h     | 5 +++--
 winsup/cygwin/syscalls.cc | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/ntdll.h b/winsup/cygwin/ntdll.h
index 7eee383dd..4504bdf6d 100644
--- a/winsup/cygwin/ntdll.h
+++ b/winsup/cygwin/ntdll.h
@@ -1638,13 +1638,14 @@ extern "C"
 
   /* RtlInitEmptyUnicodeString is defined as a macro in wdm.h, but that file
      is missing entirely in w32api. */
+
   inline
-  VOID NTAPI RtlInitEmptyUnicodeString(PUNICODE_STRING dest, PCWSTR buf,
+  VOID NTAPI RtlInitEmptyUnicodeString(PUNICODE_STRING dest, PWSTR buf,
 				       USHORT len)
   {
     dest->Length = 0;
     dest->MaximumLength = len;
-    dest->Buffer = (PWSTR) buf;
+    dest->Buffer = buf;
   }
   /* Like RtlInitEmptyUnicodeString, but initialize Length to len, too.
      This is for instance useful when creating a UNICODE_STRING from an
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 6f7efa928..c34de2929 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -561,7 +561,7 @@ try_to_bin (path_conv &pc, HANDLE &fh, ACCESS_MASK access, ULONG flags)
     {
       /* In the remote case we need the full path, but recycler is only
 	 a relative path.  Convert to absolute path. */
-      RtlInitEmptyUnicodeString (&fname, (PCWSTR) tp.w_get (),
+      RtlInitEmptyUnicodeString (&fname, tp.w_get (),
 				 (NT_MAX_PATH - 1) * sizeof (WCHAR));
       RtlCopyUnicodeString (&fname, pc.get_nt_native_path ());
       RtlSplitUnicodePath (&fname, &fname, NULL);