Fix strict-warnings build

crypto/evp/e_aes.c: Types of inp and out parameters of
AES_xts_en/decrypt functions need to be changed from char to
unsigned char to avoid build error due to
'-Werror=incompatible-pointer-types'.

crypto/aes/asm/aes-s390x.pl: Comments need to reflect the above
change.
Signed-off-by: NPatrick Steuer <psteuer@mail.de>
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
CLA: trivial

crypto/aes/asm/aes-s390x.pl

@@ -1575,8 +1575,8 @@ ___
 }
 
 ########################################################################
-# void AES_xts_encrypt(const char *inp,char *out,size_t len,
-#	const AES_KEY *key1, const AES_KEY *key2,
+# void AES_xts_encrypt(const unsigned char *inp, unsigned char *out,
+#	size_t len, const AES_KEY *key1, const AES_KEY *key2,
 #	const unsigned char iv[16]);
 #
 {
@@ -1944,8 +1944,8 @@ $code.=<<___;
 	br	$ra
 .size	AES_xts_encrypt,.-AES_xts_encrypt
 ___
-# void AES_xts_decrypt(const char *inp,char *out,size_t len,
-#	const AES_KEY *key1, const AES_KEY *key2,
+# void AES_xts_decrypt(const unsigned char *inp, unsigned char *out,
+#	size_t len, const AES_KEY *key1, const AES_KEY *key2,
 #	const unsigned char iv[16]);
 #
 $code.=<<___;

crypto/evp/e_aes.c

@@ -135,10 +135,10 @@ void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
                        const unsigned char ivec[AES_BLOCK_SIZE]);
 #endif
 #ifdef AES_XTS_ASM
-void AES_xts_encrypt(const char *inp, char *out, size_t len,
+void AES_xts_encrypt(const unsigned char *inp, unsigned char *out, size_t len,
                      const AES_KEY *key1, const AES_KEY *key2,
                      const unsigned char iv[16]);
-void AES_xts_decrypt(const char *inp, char *out, size_t len,
+void AES_xts_decrypt(const unsigned char *inp, unsigned char *out, size_t len,
                      const AES_KEY *key1, const AES_KEY *key2,
                      const unsigned char iv[16]);
 #endif