readahead: drop dead code in ondemand_readahead()

ondemand_readahead() scales up the readahead window if the current read
would hit the readahead mark placed by itself.  However the condition is
mostly dead code because:

a) In case of async readahead we always increase ra->start so ra->start
   == index is never true.

b) In case of sync readahead we either go through
   try_context_readahead() in which case ra->async_size == 1 < ra->size or
   we go through initial_readahead where ra->async_size == ra->size iff
   ra->size == max_pages.

So the only practical effect is reducing async_size for large initial
reads.  Make the code more obvious.

Link: https://lkml.kernel.org/r/20240625101909.12234-7-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Tested-by: Zhang Peng <zhangpengpeng0808@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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