perf hists browser: Remove superfluous null check on map
'map' is being already checked if it is NULL at the start of do_zoom_dso(), so the second subsequent check is superfluous and can be removed. Signed-off-by: NColin King <colin.king@canonical.com> Acked-by: NNamhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1471278343-14999-1-git-send-email-colin.king@canonical.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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