libs/wine: check for empty string in WINEPREFIX

[André Hentschel]

see http://bugs.winehq.org/show_bug.cgi?id=25554
---
 libs/wine/config.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libs/wine/config.c b/libs/wine/config.c
index 4a2bced..e15012b 100644
--- a/libs/wine/config.c
+++ b/libs/wine/config.c
@@ -266,7 +266,7 @@ static void init_paths(void)
 
     /* build config_dir */
 
-    if (prefix)
+    if (prefix && *prefix)
     {
         config_dir = xstrdup( prefix );
         remove_trailing_slashes( config_dir );
-- 

Best Regards, André Hentschel