[Bug 224845] Change return type to size_t.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224845

            Bug ID: 224845
           Summary: Change return type to size_t.
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bltsrc at mail.ru

r326025

/bin/dd/args.c
static uintmax_t get_num(const char *val)

type SIZE_T would be more appropriate as a return value,
because size_t could include largest size of any object.

uintmax_t on the other hand may be one of extended integer types(if
implemented, for example, 128bit number on x64), so exists possibility, that no
object could have that much size,
so its more than needed, size_t would serve better in this case.

Indeed, analogous function that does the same
static size_t get_bsz(char *val)
in OpenBSD's dd has return type size_t;

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