libmount: (parser) fix memory leak on error before end-of-file

libmount: (parser) fix memory leak on error before end-of-file

Let's simplify the loop where we add FS to the table. The optimization
for recoverable errors is a fragile overkill. The new code always
allocates and unrefs FS for each loop.

Addresses: https://github.com/karelzak/util-linux/pull/1068
Signed-off-by: Karel Zak <kzak@redhat.com>