MAINTAINERS: Fix virtio-9p file pattern

Only one pattern is allowed per F: line, split in two.
Signed-off-by: NAndreas Färber <afaerber@suse.de>
Acked-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

MAINTAINERS

@@ -462,7 +462,8 @@ F: hw/virtio*
 virtio-9p
 M: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
 S: Supported
-F: hw/9pfs/ fsdev/
+F: hw/9pfs/
+F: fsdev/
 T: https://github.com/kvaneesh/QEMU