perf: header: Regression

[Andrew Jones <drjones@redhat.com>]

The patch series that contains 7e94cfcc9d20 regresses the
header output. Below is a diff of info from before and
after the series

58,64c58,59
< # node1 meminfo  : total = 16777216 kB, free = 15712440 kB
< # node1 cpu list : 2,6,10,14,18,22,26,30
< # node2 meminfo  : total = 16777216 kB, free = 16299132 kB
< # node2 cpu list : 1,5,9,13,17,21,25,29
< # node3 meminfo  : total = 16777216 kB, free = 16217192 kB
< # node3 cpu list : 3,7,11,15,19,23,27,31
< # pmu mappings: cpu = 4, software = 1, tracepoint = 2, uncore_bbox_0 =
15, uncore_bbox_1 = 16, uncore_cbox_0 = 7, uncore_cbox_1 = 8,
uncore_cbox_2 = 9, uncore_cbox_3 = 10, uncore_cbox_4 = 11, uncore_cbox_5 =
12, uncore_cbox_6 = 13, uncore_cbox_7 = 14, uncore_mbox_0 = 19,
uncore_mbox_1 = 20, uncore_rbox_0 = 21, uncore_rbox_1 = 22, uncore_sbox_0
= 17, uncore_sbox_1 = 18, breakpoint = 5, uncore_ubox = 6, uncore_wbox =
23
---
> # numa topology : not available
> # pmu mappings: cpu = 4, software = 1, tracepoint = 2, uncore_bbox_0 =
15, uncore_bbox_1 = 16, uncore_cbox_0 = 7, uncore_cbox_1 = 8,
uncore_cbox_2 = 9, uncore_cbox_3 = 10, uncore_cbox_4 = 11, uncore_cbox_5 =
12, uncore_cbox_6 = 13, uncore_cbox_7 = 14, uncore_mbox_0 = 19# pmu
mappings: unable to read

As can be seen in the diff, before the series we had complete
numa info and pmu mappings info. After we get 

"# numa topology : not available" and "# pmu
mappings: unable to read"

Drew