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Always close profiler output file.

Reported by Guilherme Batalheiro.

(cherry picked from commit fca66335d)

Before the patch, a function `prof_finish` wrote a string
`No samples collected` to a profiler output file and then exited.
Due to early exit, the output file handle stay open. This patch
fixes the condition and the file handle is closed even if the
number of samples is equal to 0.

Sergey Bronnikov:
* added the description and the test for the problem

Part of tarantool/tarantool#11055

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