MAINTAINERS: zram: zsmalloc: Add an additional co-maintainer

Move Sergey to co-maintainer for zram/zsmalloc since he has helped to
contribute/review those areas actively for eight years, which is quite
helpful.  Since Nitin has been inactive for several years, it's time to
move his name into CREDITS.

Link: https://lkml.kernel.org/r/20221213170731.796121-1-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

CREDITS

@@ -1439,6 +1439,10 @@ N: Justin Guyett
 E: jguyett@andrew.cmu.edu
 D: via-rhine net driver hacking
 
+N: Nitin Gupta
+E: ngupta@vflare.org
+D: zsmalloc memory allocator and zram block device driver
+
 N: Danny ter Haar
 E: dth@cistron.nl
 D: /proc/cpuinfo, reboot on panic , kernel pre-patch tester ;)

MAINTAINERS

@@ -23002,8 +23002,7 @@ F:	drivers/media/pci/zoran/
 
 ZRAM COMPRESSED RAM BLOCK DEVICE DRVIER
 M:	Minchan Kim <minchan@kernel.org>
-M:	Nitin Gupta <ngupta@vflare.org>
-R:	Sergey Senozhatsky <senozhatsky@chromium.org>
+M:	Sergey Senozhatsky <senozhatsky@chromium.org>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 F:	Documentation/admin-guide/blockdev/zram.rst
@@ -23016,8 +23015,7 @@ F:	drivers/tty/serial/zs.*
 
 ZSMALLOC COMPRESSED SLAB MEMORY ALLOCATOR
 M:	Minchan Kim <minchan@kernel.org>
-M:	Nitin Gupta <ngupta@vflare.org>
-R:	Sergey Senozhatsky <senozhatsky@chromium.org>
+M:	Sergey Senozhatsky <senozhatsky@chromium.org>
 L:	linux-mm@kvack.org
 S:	Maintained
 F:	Documentation/mm/zsmalloc.rst