rng-egd: remove redundant free

We didn't set default chr_name, the free is redundant.

Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

backends/rng-egd.c

diff --git a/backends/rng-egd.c b/backends/rng-egd.c
index 9e5a536..6f56f9e 100644
--- a/backends/rng-egd.c
+++ b/backends/rng-egd.c
@@ -167,7 +167,6 @@
     if (b->opened) {
         error_set(errp, QERR_PERMISSION_DENIED);
     } else {
-        g_free(s->chr_name);
         s->chr_name = g_strdup(value);
     }
 }