MFC r284346:

MFC r284346:

Fix the following clang 3.7.0 warnings in lib/libfetch/http.c:

    lib/libfetch/http.c:1628:26: error: address of array 'purl->user'
    will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
                                    aparams.user = purl->user ?
                                                   ~~~~~~^~~~ ~
    lib/libfetch/http.c:1630:30: error: address of array 'purl->pwd'
    will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
                                    aparams.password = purl->pwd?
                                                       ~~~~~~^~~~
    lib/libfetch/http.c:1657:25: error: address of array 'url->user'
    will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
                                    aparams.user = url->user ?
                                                   ~~~~~^~~~ ~
    lib/libfetch/http.c:1659:29: error: address of array 'url->pwd'
    will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
                                    aparams.password = url->pwd ?
                                                       ~~~~~^~~ ~
    lib/libfetch/http.c:1669:25: error: address of array 'url->user'
    will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
                                    aparams.user = url->user ?
                                                   ~~~~~^~~~ ~
    lib/libfetch/http.c:1671:29: error: address of array 'url->pwd'
    will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
                                    aparams.password = url->pwd ?
                                                       ~~~~~^~~ ~

Since url->user and url->pwd are arrays, they can never be NULL, so the
checks can be removed.

Reviewed by:	bapt
Differential Revision: https://reviews.freebsd.org/D2673

git-svn-id: svn://svn.freebsd.org/base/stable/10@284643 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f