procfs: fix cat status error when meet long thread name

nsh> cat /proc/3/status
Name:       init123456789987654Type:       Task
Group:      3
State:      Running

Change-Id: Iddef8fa1fe3a02d407244f46fa05e3f35dd7c84e
Signed-off-by: ligd <liguiding1@xiaomi.com>

fs/procfs/fs_procfsproc.c

@@ -459,8 +459,8 @@ static ssize_t proc_status(FAR struct proc_file_s *procfile,
 #else
   name       = "<noname>";
 #endif
-  linesize   = procfs_snprintf(procfile->line, STATUS_LINELEN, "%-12s%s\n",
-                               "Name:", name);
+  linesize   = procfs_snprintf(procfile->line, STATUS_LINELEN,
+                               "%-12s%.18s\n", "Name:", name);
   copysize   = procfs_memcpy(procfile->line, linesize, buffer, remaining,
                              &offset);