Fix trivial memory leaks

Fixed trivial memory leaks detected by ASAN when running internal test
suite.

server/core/maxpasswd.c

@@ -33,6 +33,7 @@
 #include <maxscale/paths.h>
 #include <maxscale/log_manager.h>
 #include <maxscale/random_jkiss.h>
+#include <maxscale/alloc.h>
 
 #include "internal/secrets.h"
 
@@ -183,6 +184,7 @@ int main(int argc, char **argv)
     if (enc)
     {
         printf("%s\n", enc);
+        MXS_FREE(enc);
     }
     else
     {

server/core/service.cc

@@ -105,11 +105,12 @@ SERVICE* service_alloc(const char *name, const char *router)
     SERVICE *service = (SERVICE *)MXS_CALLOC(1, sizeof(*service));
     SERVICE_REFRESH_RATE* rate_limits = (SERVICE_REFRESH_RATE*)MXS_CALLOC(config_threadcount(),
                                                                          sizeof(*rate_limits));
-    if (!my_name || !my_router || !service)
+    if (!my_name || !my_router || !service || !rate_limits)
     {
         MXS_FREE(my_name);
         MXS_FREE(my_router);
         MXS_FREE(service);
+        MXS_FREE(rate_limits);
         return NULL;
     }
 
@@ -131,6 +132,7 @@ SERVICE* service_alloc(const char *name, const char *router)
         MXS_FREE(my_name);
         MXS_FREE(my_router);
         MXS_FREE(service);
+        MXS_FREE(rate_limits);
         return NULL;
     }
 

server/modules/routing/binlogrouter/test/testbinlog.c

@@ -845,5 +845,6 @@ int main(int argc, char **argv)
     mxs_log_finish();
 
     MXS_FREE(inst);
+    MXS_FREE(roptions);
     return 0;
 }