[Bug 293266] kern_descrip.c: Don't free in-use fd map in fdgrowtable()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293266

            Bug ID: 293266
           Summary: kern_descrip.c: Don't free in-use fd map in
                    fdgrowtable()
           Product: Base System
           Version: CURRENT
          Hardware: Any
               URL: https://github.com/freebsd/freebsd-src/pull/2029
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: kris@tranception.com

When expanding a file table, the condition for allocating a new map is
NDSLOTS(nnfiles) > NDSLOTS(onfiles) whereas for freeing the old map is
NDSLOTS(onfiles) > NDSLOTS(NDFILE).

If a previously expanded file table is expanded slightly again such that the
map does not need to be increased, fdgrowtable will free the current map
regardless.

Change the condition for freeing the old map such that the old map is only
freed if a new map has been allocated and the old map was not the original
static allocation.

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