Fix coverity issue 394862 - Argument cannot be negative (#15324)

* Fix coverity 394862 - Argument cannot be negative

* If GUID write fails, no point in trying to add newline

1 files changed, 7 insertions, 9 deletions

diff --git a/claim/claim.c b/claim/claim.c
index 4e4161b2d5..6a9f75ef45 100644
--- a/claim/claim.c
+++ b/claim/claim.c
@@ -253,17 +253,15 @@ bool netdata_random_session_id_generate(void) {
         netdata_log_error("Cannot create random session id file '%s'.", filename);
         ret = false;
     }
-
-    if(write(fd, guid, UUID_STR_LEN - 1) != UUID_STR_LEN - 1) {
-        netdata_log_error("Cannot write the random session id file '%s'.", filename);
-        ret = false;
+    else {
+        if (write(fd, guid, UUID_STR_LEN - 1) != UUID_STR_LEN - 1) {
+            netdata_log_error("Cannot write the random session id file '%s'.", filename);
+            ret = false;
+        } else
+            (void) write(fd, "\n", 1);
+        close(fd);
     }
 
-    ssize_t rc = write(fd, "\n", 1);
-    (void)rc;
-
-    close(fd);
-
     if(ret && (!netdata_random_session_id_filename || strcmp(netdata_random_session_id_filename, filename) != 0)) {
         freez(netdata_random_session_id_filename);
         netdata_random_session_id_filename = strdupz(filename);