column: fix leading space characters bug

The bug has been introduced during column(1) rewrite. The function
read_input() need to skip leading space only temporary to detect empty
lines, but the rest of the code has to use the original buffer (line).

Addresses: https://github.com/karelzak/util-linux/issues/575
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1560283
Signed-off-by: Karel Zak <kzak@redhat.com>
1 file changed