Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/crypto/xts.c b/crypto/xts.c
index 555ecaa..8517054 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -45,7 +45,7 @@
 		return -EINVAL;
 	}
 
-	/* we need two cipher instances: one to compute the inital 'tweak'
+	/* we need two cipher instances: one to compute the initial 'tweak'
 	 * by encrypting the IV (usually the 'plain' iv) and the other
 	 * one to encrypt and decrypt the data */