Problem: poller_t::wait_all and active_poller_t::wait declare int ret…

[sigiesec]

…urn type but actually return an element count

Solution: change return type to size_t, remove a redundant if in consequence

[coveralls]

Pull Request Test Coverage Report for Build 88

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 56.061%

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Files with Coverage Reduction	New Missed Lines	%
zmq.hpp	2	63.01%

Totals
Change from base Build 87:	0.0%
Covered Lines:	37
Relevant Lines:	66

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💛 - Coveralls