p_current cannot be NULL.

Fix #11930, #11693

Also fix free() of undefined pointer if sout packetizer is deleted
before it is fed any single block.

This was never used. The web interface requires a password instead.

val is always zero in the removed code; the verification status is what
actually matters.

...if *next is '\0'.

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

The master program clock does not necessarily have a reference
A different program PCR can be issued first, and the assertion
would be triggered since c3bd897e