media: dvb-core: dmxdev: Add braces around suspicious indent

Newer GCCs complain here that this code is missing some braces
around two statements that are both indented to the same level
after an if statement. Add the braces here to silence GCC. It
looks like bytes_ready will always be true here though, so
nothing should change in behavior even if we deindented
everything and removed the if statement.

Change-Id: Ibff7d924761c8bab346b560788884990298b2c6c
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>