perf tools: No need to check if the argument to __get() function is NULL

Those functions always check if the argument is NULL before trying to
grab a reference count, and also will return the received object, so, to
make code more compact, no need to check for NULL.

Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Krister Johansen <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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