Add zlib license to crc32.c

Signed-off-by: Jes Sorensen <[email protected]>
Signed-off-by: NeilBrown <[email protected]>

crc32.c

@@ -2,6 +2,26 @@
  * Copyright (C) 1995-2003 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  *
+ * Note: zlib license from from zlib.h added explicitly as mdadm does
+ *       not include zlib.h. License from v1.2.2 of zlib:
+ *
+ *  This software is provided 'as-is', without any express or implied
+ *  warranty.  In no event will the authors be held liable for any damages
+ *  arising from the use of this software.
+ *
+ *  Permission is granted to anyone to use this software for any purpose,
+ *  including commercial applications, and to alter it and redistribute it
+ *  freely, subject to the following restrictions:
+ *
+ *  1. The origin of this software must not be misrepresented; you must not
+ *     claim that you wrote the original software. If you use this software
+ *     in a product, an acknowledgment in the product documentation would be
+ *     appreciated but is not required.
+ *  2. Altered source versions must be plainly marked as such, and must not be
+ *     misrepresented as being the original software.
+ *  3. This notice may not be removed or altered from any source distribution.
+ *
+ *
  * Thanks to Rodney Brown <[email protected]> for his contribution of faster
  * CRC methods: exclusive-oring 32 bits of data at a time, and pre-computing
  * tables for updating the shift register in one step with three exclusive-ors