tools api io: Ensure line_len_out is always initialized

Ensure initialization to avoid compiler warnings about potential use
of uninitialized variables.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Yoshihiro Furudera <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ze Gao <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Junhao He <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: James Clark <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Athira Jajeev <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: captain5050

tools/lib/api/io.h

@@ -189,6 +189,7 @@ static inline ssize_t io__getdelim(struct io *io, char **line_out, size_t *line_
 err_out:
 	free(line);
 	*line_out = NULL;
+	*line_len_out = 0;
 	return -ENOMEM;
 }