ext4: factor out ext4_do_fallocate()

Now the real job of normal fallocate are open coded in ext4_fallocate(),
factor out a new helper ext4_do_fallocate() to do the real job, like
others functions (e.g. ext4_zero_range()) in ext4_fallocate() do, this
can make the code more clear, no functional changes.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://patch.msgid.link/20241220011637.1157197-9-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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