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sysprof: fix a message with stop without run

When sysprof is not started, the function `misc.sysprof.stop()`
reports that the profiler is already running:

| $ ./src/luajit -e 'print(misc.sysprof.stop())'
| nil     profiler is running already     22

The patch fixes that:

| $ ./src/luajit -e 'print(misc.sysprof.stop())'
| nil     profiler is not running         22

Follows up tarantool/tarantool#781

Reviewed-by: Sergey Kaplun <skaplun@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>
(cherry picked from commit 441405c39)

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