add comment for prev change

diff --git a/src/who.c b/src/who.c
index c57e14fd863fb1f3e5ac5e2812863342aa8f2cb4..ffcb6550fcf517d07e51b62b1adaf88025e47d63 100644 (file)
--- a/src/who.c
+++ b/src/who.c
@@ -393,6 +393,8 @@ static char *
 make_id_equals_comment (STRUCT_UTMP const *utmp_ent)
 {
   char *comment = xmalloc (sizeof (_("id=")) + sizeof UT_ID (utmp_ent) + 1);
+
+  /* Cast field width argument to `int' to avoid warning from gcc.  */
   sprintf (comment, "%s%.*s", _("id="), (int) sizeof UT_ID (utmp_ent),
           UT_ID (utmp_ent));
   return comment;