Fix bug 5805: don't close stdout

- When calling setup_logging multiple times, the code was closing the debug
  file descriptor before opening or assigning the new one.  We don't, however,
  want to close the debug file descriptor if it is stdout.

Derrell

source3/lib/debug.c

@@ -578,7 +578,9 @@ void setup_logging(const char *pname, bool interactive)
 	stdout_logging = False;
 	if (dbf) {
 		x_fflush(dbf);
-		(void) x_fclose(dbf);
+                if (dbf != x_stdout) {
+                        (void) x_fclose(dbf);
+                }
 	}
 
 	dbf = NULL;