net/firmare: Ignore .cis files

Signed-off-by: Matt Kraai <kraai@ftbfs.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/firmware/cis/.gitignore b/firmware/cis/.gitignore
new file mode 100644
index 0000000..1de3984
--- /dev/null
+++ b/firmware/cis/.gitignore
@@ -0,0 +1 @@
+*.cis