libfdt: Make fdt_check_header() public

Changed _fdt_check_header() to fdt_check_header() and made it part of
the interface - it is a useful routine.

Also did some asthetics cleanup to the include files (headers).
diff --git a/include/fdt.h b/include/fdt.h
index 48ccfd9..3dd3aca 100644
--- a/include/fdt.h
+++ b/include/fdt.h
@@ -1,3 +1,22 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
 #ifndef _FDT_H
 #define _FDT_H
 
diff --git a/include/libfdt.h b/include/libfdt.h
index a0b4d55..61f56ec 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -1,5 +1,3 @@
-#ifndef _LIBFDT_H
-#define _LIBFDT_H
 /*
  * libfdt - Flat Device Tree manipulation
  * Copyright (C) 2006 David Gibson, IBM Corporation.
@@ -19,6 +17,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef _LIBFDT_H
+#define _LIBFDT_H
+
 #include <fdt.h>
 #include <libfdt_env.h>
 
@@ -60,6 +61,8 @@
 #define fdt_set_header(fdt, field, val) \
 	((struct fdt_header *)(fdt))->field = cpu_to_fdt32(val)
 
+int fdt_check_header(const void *fdt);
+
 void *fdt_offset_ptr(const void *fdt, int offset, int checklen);
 
 #define fdt_offset_ptr_typed(fdt, offset, var) \
diff --git a/include/libfdt_env.h b/include/libfdt_env.h
index 6c77852..e746314 100644
--- a/include/libfdt_env.h
+++ b/include/libfdt_env.h
@@ -1,3 +1,23 @@
+/*
+ * libfdt - Flat Device Tree manipulation (build/run environment adaptation)
+ * Copyright (C) 2007 Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
+ * Original version written by David Gibson, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
 #ifndef _LIBFDT_ENV_H
 #define _LIBFDT_ENV_H