perf event-parse: Use pr_warning()

Convert sole user of warning() in this file to pr_warning(),
consolidating error reporting facilities.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-3y7yf6v673ujl2rcs34tzv8n@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/trace-event-parse.c

@@ -24,7 +24,7 @@
 #include <errno.h>
 
 #include "../perf.h"
-#include "util.h"
+#include "debug.h"
 #include "trace-event.h"
 
 #include "sane_ctype.h"
@@ -150,7 +150,7 @@ void parse_ftrace_printk(struct pevent *pevent,
 	while (line) {
 		addr_str = strtok_r(line, ":", &fmt);
 		if (!addr_str) {
-			warning("printk format with empty entry");
+			pr_warning("printk format with empty entry");
 			break;
 		}
 		addr = strtoull(addr_str, NULL, 16);