make LKDTM depend on BLOCK

Make LKDTM depend on BLOCK to prevent build failures with certain configs.
Signed-off-by: Chris Snook <csnook@redhat.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/Kconfig.debug

@@ -527,6 +527,7 @@ config LKDTM
 	tristate "Linux Kernel Dump Test Tool Module"
 	depends on DEBUG_KERNEL
 	depends on KPROBES
+	depends on BLOCK
 	default n
 	help
 	This module enables testing of the different dumping mechanisms by