Returning a value from swri::Subscriber::blockTimeouts
Returning a value from swri::Subscriber::blockTimeouts

The swri::Subscriber::blockTimeouts function had a return type but
was not explicitly returning a value.  This behavior is undefined.
It's simply chaining a call to a different blockTimeouts function, so
I made it return that.

pjreed/marti_common,elliotjo/marti_common,swri-robotics/marti_common,swri-robotics/marti_common,evenator/marti_common,evenator/marti_common,pjreed/marti_common,elliotjo/marti_common,pjreed/marti_common,evenator/marti_common,swri-robotics/marti_common,evenator/marti_common,elliotjo/marti_common,pjreed/marti_common,elliotjo/marti_common,swri-robotics/marti_common