crypto: lib - add module license to libsha1

libsha1 can be a module, so it needs a MODULE_LICENSE.

Fixes: ec8f7f4821d5 ("crypto: lib - make the sha1 library optional")
Reported-by: Randy Dunlap <[e-mail]>
Signed-off-by: Eric Biggers <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

lib/crypto/sha1.c

···
 
 #include <linux/kernel.h>
 #include <linux/export.h>
+#include <linux/module.h>
 #include <linux/bitops.h>
 #include <linux/string.h>
 #include <crypto/sha1.h>
···
 	buf[4] = 0xc3d2e1f0;
 }
 EXPORT_SYMBOL(sha1_init);
+
+MODULE_LICENSE("GPL");