map_cli example fails gets

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On -cpp 1.5 (exact tag without further commits, but reproduces with unreleased stable-1.5 and with master), the map_cli example fails on every "get" operation.

• PMDK package version(s): 1.5 (exact tag, as packaged in Debian)
• OS(es) version(s): Debian unstable
• ndctl version(s): 63-1.3
• kernel version(s): 4.20.5
• compiler, libraries, packaging and other related tools version(s): gcc 8.2, etc

Test commands that I'd expected to work:

m() { ./map_cli file persistent "$@"; }

m insert 1 1
m get 1
m insert 1 2
m get 1
m insert 2 10
m print
m remove 1
m get 1
m insert 1 3
m print

which should give:

1
2
map[1] = 2
map[2] = 10
2
key not found
map[1] = 3
map[2] = 10

Result: every "get" says, in addition to expected output, ｢invalid queue operation｣ on stderr.

I strongly suspect that this is a bug in the example rather than the library, but it's you who know better...

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