perf libunwind arm64: Fix missing close parens in an if statement

perf libunwind arm64: Fix missing close parens in an if statement

While testing building with libunwind (using LIBUNWIND=1) in various
arches I noticed a problem on arm64, on an rpi5 system, a missing close
parens in a change related to dso__data_get_fd() usage, fix it.

Fixes: 5ac22c35aa8519f1 ("perf dso: Use lock annotations to fix asan deadlock")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/Z_Z3o8KvB2i5c6ab@x1
Signed-off-by: Namhyung Kim <namhyung@kernel.org>