Sync upstream FreeBSD libm (trivial changes).

More interesting changes to come, but there's enough of this noise I'm
separating it out...

Test: treehugger
Change-Id: I0efc0ac860a147112369df7561ee48a92a2a5e84
diff --git a/libm/upstream-freebsd/lib/msun/src/s_fmax.c b/libm/upstream-freebsd/lib/msun/src/s_fmax.c
index b53b1e6..42bd11c 100644
--- a/libm/upstream-freebsd/lib/msun/src/s_fmax.c
+++ b/libm/upstream-freebsd/lib/msun/src/s_fmax.c
@@ -1,5 +1,5 @@
 /*-
- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ * SPDX-License-Identifier: BSD-2-Clause
  *
  * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
  * All rights reserved.