olm_account_last_error and olm_clear_account should take an Account not a Session

include/olm/olm.hh

@@ -52,7 +52,7 @@ size_t olm_error();
 /** A null terminated string describing the most recent error to happen to an
  * account */
 const char * olm_account_last_error(
-    OlmSession * account
+    OlmAccount * account
 );
 
 /** A null terminated string describing the most recent error to happen to a
@@ -63,7 +63,7 @@ const char * olm_session_last_error(
 
 /** Clears the memory used to back this account */
 size_t olm_clear_account(
-    OlmSession * account
+    OlmAccount * account
 );
 
 /** Clears the memory used to back this session */

src/olm.cpp

@@ -178,7 +178,7 @@ size_t olm_error() {
 
 
 const char * olm_account_last_error(
-    OlmSession * account
+    OlmAccount * account
 ) {
     unsigned error = unsigned(from_c(account)->last_error);
     if (error < sizeof(ERRORS)) {
@@ -228,7 +228,7 @@ OlmSession * olm_session(
 
 
 size_t olm_clear_account(
-    OlmSession * account
+    OlmAccount * account
 ) {
     /* Clear the memory backing the account  */
     olm::unset(account, sizeof(olm::Account));