Revert "rng-egd: remove redundant free"

This reverts commit 5e490b6a504912225dff0e520e1c6af68295d238.

Cc: qemu-stable@nongnu.org
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

backends/rng-egd.c

diff --git a/backends/rng-egd.c b/backends/rng-egd.c
index 25bb3b4..2962795 100644
--- a/backends/rng-egd.c
+++ b/backends/rng-egd.c
@@ -169,6 +169,7 @@
     if (b->opened) {
         error_set(errp, QERR_PERMISSION_DENIED);
     } else {
+        g_free(s->chr_name);
         s->chr_name = g_strdup(value);
     }
 }