utf8_unload is being called if CONFIG_UNICODE is enabled.
The ifdef block doesn't check if utf8 encoding has been loaded
or not before calling the utf8_unload() function.
This is not the expected behavior since it would sometimes lead
to unloading utf8 even before loading it.
Hence, add a condition which will check if sb->encoding is NOT NULL
before calling the utf8_unload().

Reviewed-by: Gabriel Krisman Bertazi <redacted>
Signed-off-by: Shreeya Patel <redacted>
---
 fs/ext4/super.c | 6 ++++--
 fs/f2fs/super.c | 9 ++++++---
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ad34a37278cd..e438d14f9a87 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c

@@ -1259,7 +1259,8 @@ static void ext4_put_super(struct super_block *sb)
 	fs_put_dax(sbi->s_daxdev);
 	fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
 #ifdef CONFIG_UNICODE
-	utf8_unload(sb->s_encoding);
+	if (sb->s_encoding)
+		utf8_unload(sb->s_encoding);
 #endif
 	kfree(sbi);
 }