[e2fsprogs PATCH] tune2fs: fix setting fsuuid::fsu_len

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Minus does not mean equals.

Besides fixing an obvious bug, this avoids the following compiler
warning with clang -Wall:

tune2fs.c:3625:20: warning: expression result unused [-Wunused-value]
                        fsuuid->fsu_len - UUID_SIZE;
                        ~~~~~~~~~~~~~~~ ^ ~~~~~~~~~

Fixes: a83e199da0ca ("tune2fs: Add support for get/set UUID ioctls.")
Cc: Jeremy Bongio <bongiojp@gmail.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 misc/tune2fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 088f87e5..7937b8b5 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -3622,7 +3622,7 @@ _("Warning: The journal is dirty. You may wish to replay the journal like:\n\n"
 		ret = -1;
 #ifdef __linux__
 		if (fsuuid) {
-			fsuuid->fsu_len - UUID_SIZE;
+			fsuuid->fsu_len = UUID_SIZE;
 			fsuuid->fsu_flags = 0;
 			memcpy(&fsuuid->fsu_uuid, new_uuid, UUID_SIZE);
 			ret = ioctl(fd, EXT4_IOC_SETFSUUID, fsuuid);
-- 
2.39.0