Add casts to SASL callbacks to avoid incompatible-pointer-types
errors.

Submitted upstream:

  <https://lore.kernel.org/autofs/878r5r4qy5.fsf@oldenburg.str.redhat.com/>

diff --git a/modules/cyrus-sasl.c b/modules/cyrus-sasl.c
index e742eaf8ebe6ce8a..78b77942ba3efd56 100644
--- a/modules/cyrus-sasl.c
+++ b/modules/cyrus-sasl.c
@@ -109,17 +109,17 @@ static int getpass_func(sasl_conn_t *, void *, int, sasl_secret_t **);
 static int getuser_func(void *, int, const char **, unsigned *);
 
 static sasl_callback_t callbacks[] = {
-	{ SASL_CB_USER, &getuser_func, NULL },
-	{ SASL_CB_AUTHNAME, &getuser_func, NULL },
-	{ SASL_CB_PASS, &getpass_func, NULL },
+	{ SASL_CB_USER, (int(*)(void)) &getuser_func, NULL },
+	{ SASL_CB_AUTHNAME, (int(*)(void)) &getuser_func, NULL },
+	{ SASL_CB_PASS, (int(*)(void)) &getpass_func, NULL },
 	{ SASL_CB_LIST_END, NULL, NULL },
 };
 
 static sasl_callback_t debug_callbacks[] = {
-	{ SASL_CB_LOG, &sasl_log_func, NULL },
-	{ SASL_CB_USER, &getuser_func, NULL },
-	{ SASL_CB_AUTHNAME, &getuser_func, NULL },
-	{ SASL_CB_PASS, &getpass_func, NULL },
+	{ SASL_CB_LOG, (int(*)(void)) &sasl_log_func, NULL },
+	{ SASL_CB_USER, (int(*)(void)) &getuser_func, NULL },
+	{ SASL_CB_AUTHNAME, (int(*)(void)) &getuser_func, NULL },
+	{ SASL_CB_PASS, (int(*)(void)) &getpass_func, NULL },
 	{ SASL_CB_LIST_END, NULL, NULL },
 };