lib: make lib/842 decompress functions static

Make the do_index and do_op functions static.

They are used only internally by the 842 decompression function,
and should be static.

Reported-By: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/lib/842/842_decompress.c b/lib/842/842_decompress.c
index 6b2b45a..dbeb058 100644
--- a/lib/842/842_decompress.c
+++ b/lib/842/842_decompress.c
@@ -214,7 +214,7 @@
 	return 0;
 }
 
-int do_index(struct sw842_param *p, u8 n)
+static int do_index(struct sw842_param *p, u8 n)
 {
 	switch (n) {
 	case 2:
@@ -228,7 +228,7 @@
 	}
 }
 
-int do_op(struct sw842_param *p, u8 o)
+static int do_op(struct sw842_param *p, u8 o)
 {
 	int i, ret = 0;