vsprintf: Start consolidating printf_spec handling

printf_spec is right now something of a mess - it's a grab-bag of state
that's interpreted inconsistently by different code, and it's scattered
throughout vsprintf.c.

We'd like to get it out of the pretty-printers, and have it be solely
the responsibility of vsprintf()/vpr_buf(), the code that parses and
handles format strings.

Most of the code that uses printf_spec is only using it for a minimum &
maximum field width - that can be done at the toplevel by checking how
much we just printed, and padding or truncating it as necessary. This
patch takes those "simple" uses of printf_spec and moves them as far up
the call stack as possible.

This patch also renames some helpers and creates new ones that don't
take printf_spec:
 - do_width_precision: new helper that handles with/precision of
   printf_spec
 - error_string		-> error_string_spec
 - check_pointer	-> check_pointer_spec
 - string		-> string_spec

Next patches will be reducing/eliminating uses of the *_spec versions.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

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