MAINTAINERS: Fix virtio-9p file pattern

Only one pattern is allowed per F: line, split in two.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 83d3568..ea32786 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -462,7 +462,8 @@
 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