Fix missing-prototype error for the print_buf functions in sample programs
Signed-off-by: Michael Schuster <michael@schuster.ms>
diff --git a/programs/psa/hmac_demo.c b/programs/psa/hmac_demo.c
index f44f9a7..683f3e5 100644
--- a/programs/psa/hmac_demo.c
+++ b/programs/psa/hmac_demo.c
@@ -59,7 +59,7 @@
const unsigned char key_bytes[32] = { 0 };
/* Print the contents of a buffer in hex */
-void print_buf(const char *title, uint8_t *buf, size_t len)
+static void print_buf(const char *title, uint8_t *buf, size_t len)
{
printf("%s:", title);
for (size_t i = 0; i < len; i++) {