[PATCH 2/3] cipher: remove unused variable idx from _gcry_pk_get_keygrip function

fixes:
../../cipher/pubkey.c: In function '_gcry_pk_get_keygrip':
../../cipher/pubkey.c:1005:7: warning: variable 'idx' set but not used [-Wunused-but-set-variable=]
 1005 |   int idx;
      |       ^~~
---
 cipher/pubkey.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/cipher/pubkey.c b/cipher/pubkey.c
index 7b133498..7120c24f 100644
--- a/cipher/pubkey.c
+++ b/cipher/pubkey.c
@@ -1002,7 +1002,6 @@ _gcry_pk_get_keygrip (gcry_sexp_t key, unsigned char *array)
   gcry_pk_spec_t *spec = NULL;
   const char *s;
   char *name = NULL;
-  int idx;
   const char *elems;
   gcry_md_hd_t md = NULL;
   int okay = 0;
@@ -1047,7 +1046,7 @@ _gcry_pk_get_keygrip (gcry_sexp_t key, unsigned char *array)
   else
     {
       /* Generic method to compute a keygrip.  */
-      for (idx = 0, s = elems; *s; s++, idx++)
+      for (s = elems; *s; s++)
         {
           const char *data;
           size_t datalen;
-- 
2.51.0