Fix comment text. From emaste at freebsd.org.

platform-tracing.c

@@ -45,8 +45,8 @@ platform_disable_tracing(int strict)
 
 	/*
 	 * On FreeBSD, we should make this process untraceable.
-	 * pid=0 means "this process" and but some older kernels do not
-	 * understand that, so retry with our own pid before failing.
+	 * pid=0 means "this process" but some older kernels do not
+	 * understand that so retry with our own pid before failing.
 	 */
 	if (procctl(P_PID, 0, PROC_TRACE_CTL, &disable_trace) == 0)
 		return;