perf report: Remove warning on missing raw data for s390

Command

   # ./perf report -i /tmp/111 -D > /dev/null

emits an error message when a sample for event CRYPTO_ALL in the
perf.data file does not contain any raw data. This is ok.  Do not
trigger this warning when the sample in the perf.data files does not
contain any raw data at all.  Check for availability of raw data for all
events and return if none is available.

Output before:

  # ./perf report -i /tmp/111 -D > /dev/null
  Invalid CRYPTO_ALL raw data encountered
  Invalid CRYPTO_ALL raw data encountered
  Invalid CRYPTO_ALL raw data encountered
  #

Output after:

  # ./perf report -i /tmp/111 -D > /dev/null
  #

Fixes: b539deaf

 ("perf report: Add s390 raw data interpretation for PAI counters")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Link: https://lore.kernel.org/r/20231122092703.3163191-1-tmricht@linux.ibm.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>