make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/block/xen-blkback/xen-blkback.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240602-md-block-xen-blkback-v1-1-6ff5b58bdee1@quicinc.comSigned-off-by: Jens Axboe <axboe@kernel.dk>