Fix return type of GetAsyncKeyState.

diff --git a/include/wine/winuser16.h b/include/wine/winuser16.h
index d1d9f06..05ad22e 100644
--- a/include/wine/winuser16.h
+++ b/include/wine/winuser16.h
@@ -704,7 +704,7 @@
 DWORD       WINAPI FormatMessage16(DWORD,SEGPTR,WORD,WORD,LPSTR,WORD,LPDWORD);
 INT16       WINAPI FrameRect16(HDC16,const RECT16*,HBRUSH16);
 HWND16      WINAPI GetActiveWindow16(void);
-WORD        WINAPI GetAsyncKeyState16(INT16);
+INT16       WINAPI GetAsyncKeyState16(INT16);
 HWND16      WINAPI GetCapture16(void);
 UINT16      WINAPI GetCaretBlinkTime16(void);
 VOID        WINAPI GetCaretPos16(LPPOINT16);
diff --git a/include/winuser.h b/include/winuser.h
index ff8dbe9..c12879a 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -3822,7 +3822,7 @@
 HWND        WINAPI GetActiveWindow(void);
 HWND        WINAPI GetAncestor(HWND,UINT);
 DWORD       WINAPI GetAppCompatFlags(HTASK);
-WORD        WINAPI GetAsyncKeyState(INT);
+SHORT       WINAPI GetAsyncKeyState(INT);
 HWND        WINAPI GetCapture(void);
 UINT        WINAPI GetCaretBlinkTime(void);
 BOOL        WINAPI GetCaretPos(LPPOINT);