.mailmap: add Christophe Ricard

Different computers had different settings in the mail client.  Some
contributions appear as Christophe Ricard, others as Christophe RICARD.

Signed-off-by: Christophe Ricard <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: cricard13

.mailmap

@@ -33,6 +33,7 @@ Björn Steinbrink <[email protected]>
 Brian Avery <[email protected]>
 Brian King <[email protected]>
 Christoph Hellwig <[email protected]>
+Christophe Ricard <[email protected]>
 Corey Minyard <[email protected]>
 Damian Hobson-Garcia <[email protected]>
 David Brownell <[email protected]>