advapi32: Fix printing NULL strings.

dlls/advapi32/crypt.c

@@ -545,8 +545,8 @@ BOOL WINAPI CryptAcquireContextA (HCRYPTPROV *phProv, LPCSTR pszContainer,
 	PWSTR pProvider = NULL, pContainer = NULL;
 	BOOL ret = FALSE;
 
-	TRACE("(%p, %s, %s, %d, %08x)\n", phProv, pszContainer,
-		pszProvider, dwProvType, dwFlags);
+	TRACE("(%p, %s, %s, %d, %08x)\n", phProv, debugstr_a(pszContainer),
+              debugstr_a(pszProvider), dwProvType, dwFlags);
 
 	if ( !CRYPT_ANSIToUnicode(pszContainer, &pContainer, -1) )
 	{

dlls/advapi32/registry.c

@@ -1739,8 +1739,8 @@ LSTATUS WINAPI RegGetValueA( HKEY hKey, LPCSTR pszSubKey, LPCSTR pszValue,
     LONG ret;
 
     TRACE("(%p,%s,%s,%d,%p,%p,%p=%d)\n", 
-          hKey, pszSubKey, pszValue, dwFlags, pdwType, pvData, pcbData,
-          cbData);
+          hKey, debugstr_a(pszSubKey), debugstr_a(pszValue), dwFlags,
+          pdwType, pvData, pcbData, cbData);
 
     if (pvData && !pcbData)
         return ERROR_INVALID_PARAMETER;