[CRYPTO]: Fix XTEA implementation

The XTEA implementation was incorrect due to a misinterpretation of
operator precedence.  Because of the wide-spread nature of this
error, the erroneous implementation will be kept, albeit under the
new name of XETA.

Signed-off-by: Aaron Grothe <ajgrothe@yahoo.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/crypto/api-intro.txt

@@ -223,6 +223,7 @@ CAST5 algorithm contributors:
 
 TEA/XTEA algorithm contributors:
   Aaron Grothe
+  Michael Ringe
 
 Khazad algorithm contributors:
   Aaron Grothe