We have a couple of functions that are unused (for now) by design.
Although at least one has a flag so that gcc doesn't warn, cppcheck has its
own warnings about this.  Add specific inline suppressions for these rather
than a blanket suppression in the Makefile.

Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
 Makefile  | 1 -
 igmp.c    | 1 +
 siphash.c | 1 +
 3 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 7b3f8e1..bb349c7 100644
--- a/Makefile
+++ b/Makefile
@@ -283,7 +283,6 @@ cppcheck: $(SRCS) $(HEADERS)
 	$(SYSTEM_INCLUDES:%=--suppress=*:%/*)				\
 	$(SYSTEM_INCLUDES:%=--suppress=unmatchedSuppression:%/*)	\
 	--inline-suppr							\
-	--suppress=unusedFunction					\
 	--suppress=unusedStructMember					\
 									\
 	--suppress=unmatchedSuppression:dhcp.c				\
diff --git a/igmp.c b/igmp.c
index 2f3a9d1..da7e83d 100644
--- a/igmp.c
+++ b/igmp.c
@@ -13,4 +13,5 @@
  */
 
 /* TO BE IMPLEMENTED */
+/* cppcheck-suppress unusedFunction */
 __attribute__((__unused__)) static void unused(void) { }
diff --git a/siphash.c b/siphash.c
index ec38848..37a6d73 100644
--- a/siphash.c
+++ b/siphash.c
@@ -177,6 +177,7 @@ uint64_t siphash_20b(const uint8_t *in, const uint64_t *k)
  *
  * Return: the 64-bit hash output
  */
+/* cppcheck-suppress unusedFunction */
 uint32_t siphash_32b(const uint8_t *in, const uint64_t *k)
 {
 	uint64_t *in64 = (uint64_t *)in;
-- 
2.37.3