Constify CMS_get0_type input

Reviewed-by: NKurt Roeckx <kurt@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1215)

crypto/cms/cms_lib.c

@@ -19,7 +19,7 @@
 IMPLEMENT_ASN1_FUNCTIONS(CMS_ContentInfo)
 IMPLEMENT_ASN1_PRINT_FUNCTION(CMS_ContentInfo)
 
-const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms)
+const ASN1_OBJECT *CMS_get0_type(const CMS_ContentInfo *cms)
 {
     return cms->contentType;
 }

doc/crypto/CMS_get0_type.pod

@@ -8,7 +8,7 @@ CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content -
 
  #include <openssl/cms.h>
 
- const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms);
+ const ASN1_OBJECT *CMS_get0_type(const CMS_ContentInfo *cms);
  int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid);
  const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms);
  ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms);

include/openssl/cms.h

@@ -73,7 +73,7 @@ DECLARE_ASN1_PRINT_FUNCTION(CMS_ContentInfo)
 # define CMS_KEY_PARAM                   0x40000
 # define CMS_ASCIICRLF                   0x80000
 
-const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms);
+const ASN1_OBJECT *CMS_get0_type(const CMS_ContentInfo *cms);
 
 BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont);
 int CMS_dataFinal(CMS_ContentInfo *cms, BIO *bio);