wtsapi32: Declare a variable static

[Andrew Talbot]

Changelog:
    wtsapi32: Declare a variable static.

diff -urN a/dlls/wtsapi32/wtsapi32.c b/dlls/wtsapi32/wtsapi32.c
--- a/dlls/wtsapi32/wtsapi32.c	2006-10-07 17:37:07.000000000 +0100
+++ b/dlls/wtsapi32/wtsapi32.c	2007-02-03 14:09:35.000000000 +0000
@@ -25,7 +25,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(wtsapi);
 
-HMODULE WTSAPI32_hModule = 0;
+static HMODULE WTSAPI32_hModule;
 
 BOOL WINAPI DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {