perf data: Add missing unistd.h header needed for pid_t

Noticed when processing 'perf kwork' that includes util/data.h without,
by luck, having included unistd.h indirectly to get the pid_t typedef.

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

diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 173132d502f57516827a5fd23fc265a745efb3d8..effcc195d7e9c0404cb6a90db236a4cf1761c6d7 100644 (file)
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <stdbool.h>
+#include <unistd.h>
 #include <linux/types.h>
 
 enum perf_data_mode {