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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 profiler output file and then exits.
Due to early exit, output file handle stay opened. This patch
fixes condition and file handle is closed even a 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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