fix quoting of Ted's name in MAINTAINERS

Unpaired quotes really confuse mutt when copy & pasting it into the To:
form.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
[ I'm going to remove all silly quotes entirely one day, but that day is
  not today.  So I'll just apply this  - Linus ]
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -7304,7 +7304,7 @@ F:	Documentation/blockdev/ramdisk.txt
 F:	drivers/block/brd.c
 
 RANDOM NUMBER DRIVER
-M:	Theodore Ts'o" <tytso@mit.edu>
+M:	"Theodore Ts'o" <tytso@mit.edu>
 S:	Maintained
 F:	drivers/char/random.c