ext4: remove redundant statement

The local variable assignment at the end of the function is meaningless.

The clang_analyzer complains as follows:

fs/ext4/fast_commit.c:779:2 warning:

Value stored to 'dst' is never read
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: luo penghao <luo.penghao@zte.com.cn>
Link: https://lore.kernel.org/r/20211104063406.2747-1-luo.penghao@zte.comSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/fast_commit.c

@@ -746,7 +746,6 @@ static bool ext4_fc_add_dentry_tlv(struct super_block *sb, u32 *crc,
 	ext4_fc_memcpy(sb, dst, &fcd, sizeof(fcd), crc);
 	dst += sizeof(fcd);
 	ext4_fc_memcpy(sb, dst, fc_dentry->fcd_name.name, dlen, crc);
-	dst += dlen;
 
 	return true;
 }