fix memory leaks and mismatches of the use of the z functions for allocations (#12841)

* fix mismatches of the use of the z functions for allocations

* when there was no memory; the original name of the dimensions was freed, and with mismatching deallocator..

* fixed memory leak at rrdeng_load_metric_*() functions

* fixed memory leak on exit of plugins.d parser

* fixed memory leak on plugins and streaming receiver threads exit

* fixed compiler warnings

1 files changed, 1 insertions, 11 deletions

diff --git a/parser/parser.c b/parser/parser.c
index 5fc601cea0..5137cb61cf 100644
--- a/parser/parser.c
+++ b/parser/parser.c
@@ -33,20 +33,12 @@ PARSER *parser_init(RRDHOST *host, void *user, void *input, PARSER_INPUT_TYPE fl
     PARSER *parser;
 
     parser = callocz(1, sizeof(*parser));
-
-    if (unlikely(!parser))
-        return NULL;
-
     parser->plugins_action = callocz(1, sizeof(PLUGINSD_ACTION));
-    if (unlikely(!parser->plugins_action)) {
-        freez(parser);
-        return NULL;
-    }
-
     parser->user = user;
     parser->input = input;
     parser->flags = flags;
     parser->host = host;
+
 #ifdef ENABLE_HTTPS
     parser->bytesleft = 0;
     parser->readfrom = NULL;
@@ -181,9 +173,7 @@ void parser_destroy(PARSER *parser)
     }
 
     freez(parser->plugins_action);
-
     freez(parser);
-    return;
 }