crypto: serpent_sse2 - Fix a typo in Kconfig

This patch fix a spelling typo in crypto/Kconfig.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 88639937a..8aaf298 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1188,7 +1188,7 @@
 	  Keys are allowed to be from 0 to 256 bits in length, in steps
 	  of 8 bits.
 
-	  This module provides Serpent cipher algorithm that processes eigth
+	  This module provides Serpent cipher algorithm that processes eight
 	  blocks parallel using SSE2 instruction set.
 
 	  See also: