perf tools: Move the temp file processing into decompress_kmodule

We will add a compression check in the following patch and it makes it
easier if the file processing is done in a single place. It also makes
the current code simpler.

The decompress_kmodule function now returns the fd of the uncompressed
file and the file name in the pathname arg, if it's provided.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180817094813.15086-10-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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