Fixed DrawTextW length handling.

objects/text.c

diff --git a/objects/text.c b/objects/text.c
index aa07e18..3d0de8d 100644
--- a/objects/text.c
+++ b/objects/text.c
@@ -327,6 +327,7 @@
     acount = WideCharToMultiByte(codepage,0,str,count,NULL,0,NULL,NULL);
     p = HeapAlloc( GetProcessHeap(), 0, acount );
     acount = WideCharToMultiByte(codepage,0,str,count,p,acount,NULL,NULL);
+    if (count == -1) acount = -1;
     ret = DrawTextA( hdc, p, acount, rect, flags );
 
     HeapFree( GetProcessHeap(), 0, p );