ext4: Use %pe to print PTR_ERR()

Replace %ld with %pe and PTR_ERR(path) with path pointer.
The %pe specifier automatically converts error pointers to
human-readable error names instead of raw error codes.

These changes were found by coccicheck.

Signed-off-by: Abdellah Ouhbi <abdououhbi1@gmail.com>
Link: https://patch.msgid.link/20260424154307.169881-1-abdououhbi1@gmail.com
Link: https://patch.msgid.link/20260424155508.186235-1-abdououhbi1@gmail.com
Link: https://patch.msgid.link/20260424152245.142308-1-abdououhbi1@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>