[PATCH v5 6/6] trace-cmd library: Set the correct file state when reading file with no ftrace printk data

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@xxxxxxxxx>]

The ftrace printk section of the trace file can contain no data, this is
valid use case. When such file is read and parsed by read_ftrace_printk,
the file state should be set to TRACECMD_FILE_PRINTK in that case.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
 lib/trace-cmd/trace-input.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index f02d7e31..31e5e674 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -783,8 +783,10 @@ static int read_ftrace_printk(struct tracecmd_input *handle)
 
 	if (read4(handle, &size) < 0)
 		return -1;
-	if (!size)
+	if (!size) {
+		handle->file_state = TRACECMD_FILE_PRINTK;
 		return 0; /* OK? */
+	}
 
 	buf = malloc(size + 1);
 	if (!buf)
-- 
2.33.1