reduce scope of variable to prevent unused argument warning

Author: bigbrett

src/image.c

@@ -417,7 +417,6 @@ static void wolfBoot_verify_signature_rsa(uint8_t key_slot,
     int ret;
     uint8_t output[RSA_IMAGE_SIGNATURE_SIZE];
     uint8_t* digest_out = NULL;
-    word32 inOutIdx = 0;
     struct RsaKey rsa;
 
 #if (!defined(WOLFBOOT_ENABLE_WOLFHSM_CLIENT) && \
@@ -519,6 +518,7 @@ static void wolfBoot_verify_signature_rsa(uint8_t key_slot,
     /* wolfCrypt software RSA verify */
     ret = wc_InitRsaKey(&rsa, NULL);
     if (ret == 0) {
+        word32 inOutIdx = 0;
         /* Import public key */
         ret = wc_RsaPublicKeyDecode((byte*)pubkey, &inOutIdx, &rsa, pubkey_sz);
         if (ret >= 0) {