MAINTAINERS: update list for NBD

[email protected] becomes [email protected], because
sourceforge is just a spamtrap these days.

Signed-off-by: Wouter Verhelst <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

Author: yoe

MAINTAINERS

@@ -9348,7 +9348,7 @@ NETWORK BLOCK DEVICE (NBD)
 M:	Josef Bacik <[email protected]>
 S:	Maintained
 L:	[email protected]
-L:	nbd[email protected]
+L:	nbd@other.debian.org
 F:	Documentation/blockdev/nbd.txt
 F:	drivers/block/nbd.c
 F:	include/uapi/linux/nbd.h