lib/lz4: correct the LZ4 license

The LZ4 code is listed as using the "BSD 2-Clause License".

Signed-off-by: Richard Laager <[e-mail]>
Acked-by: Kyungsik Lee <[e-mail]>
Cc: Chanho Min <[e-mail]>
Cc: Richard Yao <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
[ The 2-clause BSD can be just converted into GPL, but that's rude and
pointless, so don't do it - Linus ]
Signed-off-by: Linus Torvalds <[e-mail]>

lib/lz4/lz4_compress.c

···
 exit:
 	return ret;
 }
-EXPORT_SYMBOL_GPL(lz4_compress);
+EXPORT_SYMBOL(lz4_compress);
 
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("LZ4 compressor");

lib/lz4/lz4_decompress.c

···
 	return ret;
 }
 #ifndef STATIC
-EXPORT_SYMBOL_GPL(lz4_decompress);
+EXPORT_SYMBOL(lz4_decompress);
 #endif
 
 int lz4_decompress_unknownoutputsize(const char *src, size_t src_len,
···
 	return ret;
 }
 #ifndef STATIC
-EXPORT_SYMBOL_GPL(lz4_decompress_unknownoutputsize);
+EXPORT_SYMBOL(lz4_decompress_unknownoutputsize);
 
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("LZ4 Decompressor");
 #endif

lib/lz4/lz4hc_compress.c

···
 exit:
 	return ret;
 }
-EXPORT_SYMBOL_GPL(lz4hc_compress);
+EXPORT_SYMBOL(lz4hc_compress);
 
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("LZ4HC compressor");