Codecs: strip codec name while parsing allow/disallow options

Failed registration using PJSIP/Realtime if one of the codec name
in allow/disallow option is wrong or contains space.

This patch strip codec name.

ASTERISK-25914

Change-Id: Ifdf02de94e5ddbce305640f6f0666084a3b9283d

main/format_cap.c

@@ -342,7 +342,7 @@ int ast_format_cap_update_by_allow_disallow(struct ast_format_cap *cap, const ch
 	}
 
 
-	while ((this = strsep(&parse, ",|"))) {
+	while ((this = ast_strip(strsep(&parse, ",|")))) {
 		int framems = 0;
 		struct ast_format *format = NULL;