Update `api/v1/info ` (#7862)

* update_info: New variables

This commit creates inside script and it reads them to Netdata

* update_info: API

This commit changes the web api response

* update_info: Disk space

This commit brings the disk space to info and renames the environment variables inside Netdata

* update_info: Rename variable

This commit renames the environment variable

* update_info: Rename response variable

This commit renames a response variable

* update_info: Labels

This commit creates the missing labels

* update_info: test before free

* update_info: Doc function

This commit brings docummentation to the functions to give instructions to developer

* update_info: Fix info message

This commit removes some info messages from the error.log

* update_info: Remove unecessary ifs, considering free manual

1 files changed, 1 insertions, 0 deletions

diff --git a/libnetdata/libnetdata.c b/libnetdata/libnetdata.c
index 095c38c25e..70b656d838 100644
--- a/libnetdata/libnetdata.c
+++ b/libnetdata/libnetdata.c
@@ -168,6 +168,7 @@ char *strdupz(const char *s) {
     return t;
 }
 
+// If ptr is NULL, no operation is performed.
 void freez(void *ptr) {
     free(ptr);
 }