input/stream: make stream_ReadLine work with block-based streams
input/stream: make stream_ReadLine work with block-based streams

The if-statement in question prevents stream_ReadLine to work if invoked
with a block-based stream, as such the condition has now been altered to
only return immediately if the source stream does not have neither of
pf_read and pf_block.

Signed-off-by: Rémi Denis-Courmont <f0699137713be92736351a0674e79536595e4a60@remlab.net>

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc