Fix dead URLs to ftp.kernel.org

URLs to ftp.kernel.org are still exist though the service is closed [0].
This commit fixes the URLs to use www.kernel.org instead.

[0] https://www.kernel.org/shutting-down-ftp-services.html

Signed-off-by: SeongJae Park <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

MAINTAINERS

···
 PREEMPTIBLE KERNEL
 M:	Robert Love <[e-mail]>
 L:	[e-mail]
-W:	ftp://ftp.kernel.org/pub/linux/kernel/people/rml/preempt-kernel
+W:	https://www.kernel.org/pub/linux/kernel/people/rml/preempt-kernel
 S:	Supported
 F:	Documentation/preempt-locking.txt
 F:	include/linux/preempt.h

drivers/block/Kconfig

···
 
 	  To use the loop device, you need the losetup utility, found in the
 	  util-linux package, see
-	  <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
+	  <https://www.kernel.org/pub/linux/utils/util-linux/>.
 
 	  The loop device driver can also be used to "hide" a file system in
 	  a disk partition, floppy, or regular file, either using encryption

drivers/md/Kconfig

···
 
 	  RAID-10 requires mdadm-1.7.0 or later, available at:
 
-	  ftp://ftp.kernel.org/pub/linux/utils/raid/mdadm/
+	  https://www.kernel.org/pub/linux/utils/raid/mdadm/
 
 	  If unsure, say Y.
 

fs/autofs4/Kconfig

···
 	  automounter (amd), which is a pure user space daemon.
 
 	  To use the automounter you need the user-space tools from
-	  <ftp://ftp.kernel.org/pub/linux/daemons/autofs/v4/>; you also
+	  <https://www.kernel.org/pub/linux/daemons/autofs/v4/>; you also
 	  want to answer Y to "NFS file system support", below.
 
 	  To compile this support as a module, choose M here: the module will be

scripts/ksymoops/README

···
 ksymoops has been removed from the kernel.  It was always meant to be a
 free standing utility, not linked to any particular kernel version.
 The latest version can be found in
-ftp://ftp.<country>.kernel.org/pub/linux/utils/kernel/ksymoops together
-with patches to other utilities in order to give more accurate Oops
-debugging.
+https://www.kernel.org/pub/linux/utils/kernel/ksymoops together with patches to
+other utilities in order to give more accurate Oops debugging.
 
 Keith Owens <[e-mail]> Sat Jun 19 10:30:34 EST 1999

scripts/package/builddeb

···
 cat <<EOF > debian/copyright
 This is a packacked upstream version of the Linux kernel.
 
-The sources may be found at most Linux ftp sites, including:
-ftp://ftp.kernel.org/pub/linux/kernel
+The sources may be found at most Linux archive sites, including:
+https://www.kernel.org/pub/linux/kernel
 
 Copyright: 1991 - 2015 Linus Torvalds and others.