crda: Fix error: `keys’ defined but not used

Fix error: ‘keys’ defined but not used [-Werror=unused-const-variable=]
by informing GCC keys is unused.

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
diff --git a/utils/key2pub.py b/utils/key2pub.py
index 3e84cd2..9bb04cd 100755
--- a/utils/key2pub.py
+++ b/utils/key2pub.py
@@ -115,7 +115,7 @@
 	.n = _n, .len_n = sizeof(_n),	\
 }
 
-static const struct key_params keys[] = {
+static const struct key_params __attribute__ ((unused)) keys[] = {
 ''')
     for n in xrange(n + 1):
         output.write('	KEYS(e_%d, n_%d),\n' % (n, n))