perf unwind: Use function to add missing maps lock

Switch read_unwind_spec_eh_frame() from loop macro
maps__for_each_entry() to maps__for_each_map() function that takes a
callback. The function holds the maps lock, which should be held during
iteration.

Committer notes:

Fixed up conflict with:

  4fb54994b2360ab5 ("perf unwind-libunwind: Fix base address for .eh_frame")

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: German Gomez <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Sandipan Das <[email protected]>
Cc: Steinar H. Gunderson <[email protected]>
Cc: Wenyu Liu <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: changbin du <[email protected]>
Cc: colin ian king <[email protected]>
Cc: dmitrii dolgov <[email protected]>
Cc: guilherme amadio <[email protected]>
Cc: huacai chen <[email protected]>
Cc: k prateek nayak <[email protected]>
Cc: li dong <[email protected]>
Cc: liam howlett <[email protected]>
Cc: miguel ojeda <[email protected]>
Cc: ming wang <[email protected]>
Cc: sean christopherson <[email protected]>
Cc: vincent whitchurch <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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