Fix bug in xrefinfo_find() for 64-bit platforms

[zbb]

Summary

uintptr_t may be 64-bit on some platforms, therefore when
finding xrefinfo by pointer to device the high word is being
cut off due to cast to phandle_t which is 32-bit long by definition.
Due to that we loose the high word of the address to compare with
xi->dev's address.
To fix that, first argument of xrefinfo_find() is extended to
uintptr_t and is being cast to appropriate type (phandle_t)
when compared.

Submitted by: Zbigniew Bodek <[e-mail]>
Obtained from: Semihalf

[nwhitehorn]

Looks OK to me. Would be nice if you changed the name of the "phandle" argument to "key" or something since, in the cases where this applies, it isn't a phandle.

[zbb]

Thank you very much.
Committed to: r280848
URL: https://svnweb.freebsd.org/changeset/base/280848