debugfs: fix two warning messages when compiling with LLVM

This commit fixes two warning messages when compiling with LLVM.

Reported-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
2 files changed