imm32: Remove unneeded cast

[Andrew Talbot]

Changelog:
    imm32: Remove unneeded cast.

diff --git a/dlls/imm32/imm.c b/dlls/imm32/imm.c
index 58d0e3e..da39261 100644
--- a/dlls/imm32/imm.c
+++ b/dlls/imm32/imm.c
@@ -1082,7 +1082,7 @@ HWND WINAPI ImmGetDefaultIMEWnd(HWND hWnd)
         TRACE("Default created (%p)\n",hwndDefault);
   }
 
-  return (HWND)hwndDefault;
+  return hwndDefault;
 }
 
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