Allow codec_resample to be unloaded

Ensure that trans_size is correct to prevent uninitialized entries from
preventing reload.

(closes issue ASTERISK-21401)
Reported by: Corey Farrell
Tested by: Corey Farrell
Patches:
    codec_resample-unload.patch uploaded by Corey Farrell
........

Merged revisions 385582 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@385585 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/codec_resample.c

@@ -113,7 +113,7 @@ static int load_module(void)
 	int res = 0;
 	int x, y, idx = 0;
 
-	trans_size = ARRAY_LEN(id_list) * ARRAY_LEN(id_list);
+	trans_size = ARRAY_LEN(id_list) * (ARRAY_LEN(id_list) - 1);
 	if (!(translators = ast_calloc(1, sizeof(struct ast_translator) * trans_size))) {
 		return AST_MODULE_LOAD_FAILURE;
 	}