bsod: don't fail in an error path

If we fail in an error path, don't override the error we are processing,
just print a warning and continue.

src/journal/bsod.c

@@ -235,7 +235,7 @@ static int display_emergency_message_fullscreen(const char *message) {
 
 cleanup:
         if (original_vt > 0 && ioctl(fd, VT_ACTIVATE, original_vt) < 0)
-                return log_error_errno(errno, "Failed to switch back to original VT /dev/tty%i: %m", original_vt);
+                log_warning_errno(errno, "Failed to switch back to original VT /dev/tty%i: %m", original_vt);
 
         return r;
 }