input: don't interrupt processing at unbound events

The input code read at most one event per input or command fd. If this
event was not bound to any recognized command then no command was
returned, and higher-level code could not distinguish this case from
there being no pending events left. As a result unbound events would
cause extra latency in event processing. Change the input code to
continue reading events until it either finds one that maps to a
command or hits EOF/error.

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