SNAPPY: Add dual GPL/BSD license to snappy module

To avoid complaints from the module loader.

I made it dual because the original compression code was BSD.

Reported-by: Chris Mason
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

lib/snappy.c

diff --git a/lib/snappy.c b/lib/snappy.c
index 0b39e07..3848c6c 100644
--- a/lib/snappy.c
+++ b/lib/snappy.c
@@ -1298,3 +1298,5 @@
 	memset(env, 0, sizeof(struct snappy_env));
 }
 EXPORT_SYMBOL(snappy_free_env);
+
+MODULE_LICENSE("Dual BSD/GPL");