Use size_t to store the return value of ttydisc_getc().
Use size_t to store the return value of ttydisc_getc().

The ttydisc_getc() routine obtains a read length from ttyoutq_read().
For no valid reason, the current code stores this value in an int, and
returns a size_t. There is no need to perform this useless conversion.

Obtained from:	//depot/projects/mpsafetty/...

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