[ISSUE #583] fix printlog crash

[NAND86]

What is the purpose of the change

fix #583 pullMessage & printlog crash

Brief changelog

log print "pq.msgCache", it seems a typo causes this issue. "pq.cachedMsgCount" should be right here.

[codecov-io]

Codecov Report

Merging #588 (cd6c9c0) into master (f07155b) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #588   +/-   ##
=======================================
  Coverage   24.22%   24.22%           
=======================================
  Files          48       48           
  Lines        5011     5011           
=======================================
  Hits         1214     1214           
  Misses       3598     3598           
  Partials      199      199           

Impacted Files	Coverage Δ
consumer/push_consumer.go	11.46% <0.00%> (ø)

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