netapi32: Declare a variable static

[Andrew Talbot]

Changelog:
    netapi32: Declare a variable static.

diff -urN a/dlls/netapi32/netapi32.c b/dlls/netapi32/netapi32.c
--- a/dlls/netapi32/netapi32.c	2006-10-12 21:30:50.000000000 +0100
+++ b/dlls/netapi32/netapi32.c	2007-01-16 20:54:27.000000000 +0000
@@ -24,7 +24,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(netbios);
 
-HMODULE NETAPI32_hModule = 0;
+static HMODULE NETAPI32_hModule;
 
 BOOL WINAPI DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {