Fix some issues with the OSX port

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/os/os.h b/os/os.h
index bed12814..a14c4857 100644
--- a/os/os.h
+++ b/os/os.h
@@ -111,8 +111,11 @@ static inline int os_cache_line_size(void)
 #ifdef FIO_USE_GENERIC_BDEV_SIZE
 static inline int blockdev_size(int fd, unsigned long long *bytes)
 {
-	off_t end = lseek(fd, 0, SEEK_END);
+	off_t end;
 
+	*bytes = 0;
+
+	end = lseek(fd, 0, SEEK_END);
 	if (end < 0)
 		return errno;