perf trace: Show error message when not finding a field used in a filter expression

It was there, but as pr_debug(), make it pr_err() so that we can see it
without -v:

  # trace -e syscalls:*lseek --filter="whenc==SET" sleep 1
  "whenc" not found in "syscalls:sys_enter_lseek", can't set filter "whenc==SET"
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-ly4rgm1bto8uwc2itpaixjob@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-trace.c

@@ -3611,8 +3611,8 @@ static int trace__expand_filter(struct trace *trace __maybe_unused, struct evsel
 
 			fmt = perf_evsel__syscall_arg_fmt(evsel, arg);
 			if (fmt == NULL) {
-				pr_debug("\"%s\" not found in \"%s\", can't set filter \"%s\"\n",
-					 arg, evsel->name, evsel->filter);
+				pr_err("\"%s\" not found in \"%s\", can't set filter \"%s\"\n",
+				       arg, evsel->name, evsel->filter);
 				return -1;
 			}