nvme: make NVME_RDMA depend on BLOCK

Commit aa71987472a9 ("nvme: fabrics drivers don't need the nvme-pci
driver") removed the dependency on BLK_DEV_NVME, but the cdoe does
depend on the block layer (which used to be an implicit dependency
through BLK_DEV_NVME).

Otherwise you get various errors from the kbuild test robot random
config testing when that happens to hit a configuration with BLOCK
device support disabled.

Cc: Christoph Hellwig <[e-mail]>
Cc: Jay Freyensee <[e-mail]>
Cc: Sagi Grimberg <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/nvme/host/Kconfig

···
 
 config NVME_RDMA
 	tristate "NVM Express over Fabrics RDMA host driver"
-	depends on INFINIBAND
+	depends on INFINIBAND && BLOCK
 	select NVME_CORE
 	select NVME_FABRICS
 	select SG_POOL