[Bug libc/18641] New: pwd.h: add __nonnull markings

["vapier at gentoo dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18641

            Bug ID: 18641
           Summary: pwd.h: add __nonnull markings
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: vapier at gentoo dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

per the thread:
https://sourceware.org/ml/libc-alpha/2015-05/msg00867.html

when you use many functions in pwd.h with NULL pointers, glibc will crash. 
POSIX doesn't require NULL to be supported, so we want to mark all the funcs as
nonnull instead.  this way user code is compiled with warnings and our API
expectations are documented.

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