Don't unlink the ipc socket when not needed

I never managed to catch the obvious and silly error since the unlink call
always failed with EPERM.
Also, the ipc socket suffix has been changed to '.socket' to reflect the
undeniable fact that it's a unix socket.

ipc.c

@@ -6,7 +6,7 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 
-#define IPC_SOCKET  "/run/ldm.fifo"
+#define IPC_SOCKET  "/run/ldm.socket"
 
 void
 ipc_deinit (int fd)
@@ -29,14 +29,14 @@ ipc_init (int as_master)
 		return -1;
 	}
 
-	// Make sure that there are no leftovers
-	unlink (IPC_SOCKET);
-
 	memset(&so, 0, sizeof(struct sockaddr_un));
 	so.sun_family = AF_UNIX;
 	strncpy(so.sun_path, IPC_SOCKET, sizeof(so.sun_path));
 
 	if (as_master) {
+		// Make sure that there are no leftovers
+		unlink (IPC_SOCKET);
+
 		// The master waits for the slaves to connect
 		if (bind(sock, (struct sockaddr *)&so, sizeof(struct sockaddr_un)) < 0) {
 			perror("bind");