fs: use min() or umin() instead of min_t()

fs: use min() or umin() instead of min_t()

min_t(unsigned int, a, b) casts an 'unsigned long' to 'unsigned int'.
Use min(a, b) instead as it promotes any 'unsigned int' to 'unsigned long'
and so cannot discard significant bits.

A couple of places need umin() because of loops like:
	nfolios = DIV_ROUND_UP(ret + start, PAGE_SIZE);

	for (i = 0; i < nfolios; i++) {
		struct folio *folio = page_folio(pages[i]);
		...
		unsigned int len = umin(ret, PAGE_SIZE - start);
		...
		ret -= len;
		...
	}
where the compiler doesn't track things well enough to know that
'ret' is never negative.

The alternate loop:
        for (i = 0; ret > 0; i++) {
                struct folio *folio = page_folio(pages[i]);
                ...
                unsigned int len = min(ret, PAGE_SIZE - start);
                ...
                ret -= len;
                ...
        }
would be equivalent and doesn't need 'nfolios'.

Most of the 'unsigned long' actually come from PAGE_SIZE.

Detected by an extra check added to min_t().

Signed-off-by: David Laight <david.laight.linux@gmail.com>
Link: https://patch.msgid.link/20251119224140.8616-31-david.laight.linux@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>