Prevent potential crash on blond transfer.

Scenario:
Alice calls Bob. Bob performs a blond transfer to Carol. Carol rejects
the incoming call (or some other immediate circumstance causes Carol not
to answer the call)

What occurs in this case is that when the bridge between Alice and Bob
breaks, Alice is told to masquerade into Bob's channel that had placed
the call to Carol. The actual masquerade goes down without a hitch.
However, a channel fixup callback that attempts to publish dial events
over Stasis has a crash. The reason for this crash is that the datastore
on Bob's channel that placed the outbound call to Carol only had a bare
pointer to Carol's channel. Since Carol rejected the incoming call,
Carol's channel has been hung up and freed, meaning accessing her
channel results in a crash.

The fix here is simple. The dial fixup code has been altered to hold
references to the involved channels and to drop those references when
freeing data.

ASTERISK-25025 #close
Reported by Chet Stevens

Change-Id: I54eedda207b8ec7a69263353b43abe5746aea197

main/stasis_channels.c

@@ -1326,6 +1326,7 @@ static void dial_target_free(struct dial_target *doomed)
 		return;
 	}
 	ast_free(doomed->dialstring);
+	ast_channel_cleanup(doomed->peer);
 	ast_free(doomed);
 }
 
@@ -1348,7 +1349,7 @@ static void dial_masquerade_datastore_cleanup(struct dial_masquerade_datastore *
 	while ((cur = AST_LIST_REMOVE_HEAD(&masq_data->dialed_peers, list))) {
 		dial_target_free(cur);
 	}
-	masq_data->caller = NULL;
+	masq_data->caller = ast_channel_cleanup(masq_data->caller);
 }
 
 static void dial_masquerade_datastore_remove_chan(struct dial_masquerade_datastore *masq_data, struct ast_channel *chan)
@@ -1556,7 +1557,7 @@ static struct dial_masquerade_datastore *dial_masquerade_datastore_add(
 			ast_datastore_free(datastore);
 			return NULL;
 		}
-		masq_data->caller = chan;
+		masq_data->caller = ast_channel_ref(chan);
 	}
 
 	datastore->data = masq_data;
@@ -1604,7 +1605,7 @@ static int set_dial_masquerade(struct ast_channel *caller, struct ast_channel *p
 			return -1;
 		}
 	}
-	target->peer = peer;
+	target->peer = ast_channel_ref(peer);
 
 	/* Put peer target into datastore */
 	ao2_lock(masq_data);