cifs: convert prefixpath delimiters in cifs_build_path_to_root
cifs: convert prefixpath delimiters in cifs_build_path_to_root

Regression from 2.6.39...

The delimiters in the prefixpath are not being converted based on
whether posix paths are in effect. Fixes:

    https://bugzilla.redhat.com/show_bug.cgi?id=727834

Reported-and-Tested-by: Iain Arnell <a6bceff18d2d78c562705fd20fad0953a550e3d0@gmail.com>
Reported-by: Patrick Oltmann <d65dcd51d4262d9a77c49655c5448fcb97b8a411@gmx.net>
Cc: Pavel Shilovsky <4f25480c536b3e6717a4bc3e8e086228bf1f9227@gmail.com>
Cc: 4fbacc2fa0ffdbb11bf1ad6925b886ebd08dd15f@kernel.org
Signed-off-by: Jeff Layton <4376fbf8623cd7b7c0232225289bb91cedc0a27f@redhat.com>
Signed-off-by: Steve French <d47560e3bac353b8d509d093b1d727868ac7ddf3@us.ibm.com>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs