media: dvb-core: dvb_demux: Fix assignments in if conditions

media: dvb-core: dvb_demux: Fix assignments in if conditions

The code in dvb_demux.c has multiple instances where a variable is
assigned a value inside the conditional part of an 'if' statement.
This practice is prohibited by the Linux kernel coding style to avoid
potential bugs arising from accidental assignments (e.g., '=' instead
of '==').

This patch refactors these instances by moving the assignment out of
the 'if' statement and onto the preceding line. This makes the code
clearer, safer, and compliant with checkpatch.pl.

Additionally, a minor whitespace issue in a function signature is also
corrected. This is a purely stylistic change with no functional impact.

Signed-off-by: Darshan Rathod <darshanrathod475@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>