perf annotate: Get rid of field_sep check

The 'field_sep' variable is not set anywhere. Just remove the
conditional.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1325957132-10600-7-git-send-email-namhyung@gmail.com
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-annotate.c

@@ -313,10 +313,5 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __used)
 		annotate.sym_hist_filter = argv[0];
 	}
 
-	if (field_sep && *field_sep == '.') {
-		pr_err("'.' is the only non valid --field-separator argument\n");
-		return -1;
-	}
-
 	return __cmd_annotate(&annotate);
 }