perf test trace: Change the regex pattern in the struct test

Ian mentioned a reliably occurred failure in the trace_btf_general test
where he obtained trace output of:
    sleep/279619 clock_nanosleep(0, 0, {1,1,}, 0x7ffcd47b6450) = 0

But the regex pattern used for verification is
    "^sleep/[0-9]+ clock_nanosleep\(0, 0, \{1,\}, ..."

This lead to a mismatch.

The reason is, different sleep commands use different timespec data to
call clock_nanosleep, on my machine, the value of tv_nsec is 0.
~~~
$ sudo /tmp/perf/perf trace -e clock_nanosleep -- sleep 1
     0.000 (1000.196 ms): sleep/54261 clock_nanosleep(rqtp: { .tv_sec:
1, .tv_nsec: 0 }, rmtp: 0x7ffe13529550) = 0
~~~

While Ian had this trace log:
~~~
$ sudo /tmp/perf/perf trace -e clock_nanosleep -- sleep 1
    0.000 (1000.208 ms): sleep/1710732 clock_nanosleep(rqtp: {
.tv_sec: 1, .tv_nsec: 1 }, rmtp: 0x7ffc091f4090) = 0
~~~

Because sleep's behavior of setting 'tv_nsec' is not certain, and tv_sec
is most definitely 1, this patch relaxes the key regex pattern to
'\{1,.*\}' for a better chance of matching.

Signed-off-by: Howard Chu <[email protected]>
Tested-by: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reported-by: Ian Rogers <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>

Author: Sberm

tools/perf/tests/shell/trace_btf_general.sh

@@ -49,7 +49,7 @@ trace_test_buffer() {
 trace_test_struct_btf() {
   echo "Testing perf trace's struct augmentation"
   output="$(perf trace --sort-events -e clock_nanosleep --force-btf --max-events=1 -- sleep 1 2>&1)"
-  if ! echo "$output" | grep -q -E "^sleep/[0-9]+ clock_nanosleep\(0, 0, \{1,\}, 0x[0-9a-f]+\) += +[0-9]+$"
+  if ! echo "$output" | grep -q -E "^sleep/[0-9]+ clock_nanosleep\(0, 0, \{1,.*\}, 0x[0-9a-f]+\) += +[0-9]+$"
   then
 	printf "BTF struct augmentation test failed, output:\n$output\n"
     err=1