fix mingw build

The commit "f5b4c141" introduced new "force" parameter
for "virFDStreamOpenFileInternal" but forget to update
one call of that function.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

src/fdstream.c

@@ -769,7 +769,8 @@ int virFDStreamOpenPTY(virStreamPtr st,
 {
     return virFDStreamOpenFileInternal(st, path,
                                        offset, length,
-                                       oflags | O_CREAT, 0);
+                                       oflags | O_CREAT, 0,
+                                       false);
 }
 #endif /* !HAVE_CFMAKERAW */