Print warning if calculated hash is incorrect

If the calculated hash of a share does not match the configured
hash, give the user a warning.

src/gfsec-use.c

@@ -124,6 +124,20 @@ get_config_file(const char *filename, char *buffer, size_t len)
     return rc;
 }
 
+static char *
+get_share_display_name(gfsec_share_t *share)
+{
+    static char buffer[256];
+    char *schemes[] = { "file://", "uuid://", "label://", "mtp://" };
+
+    snprintf(buffer, sizeof(buffer), "%s%s%s",
+            schemes[share->scheme],
+            share->authority ? share->authority : "",
+            share->path);
+
+    return buffer;
+}
+
 static int
 get_share_data(gfsec_share_t *share, gcry_md_hd_t md)
 {
@@ -161,6 +175,7 @@ get_share_data(gfsec_share_t *share, gcry_md_hd_t md)
         md_val = gcry_md_read(md, 0);
 
         if ( memcmp(share->sha256, md_val, 32) != 0 ) {
+            warnx("Incorrect hash value for share %s\n", get_share_display_name(share));
             free(share->data);
             share->data = NULL;
             rc = -1;
@@ -172,20 +187,6 @@ get_share_data(gfsec_share_t *share, gcry_md_hd_t md)
     return rc;
 }
 
-static char *
-get_share_display_name(gfsec_share_t *share)
-{
-    static char buffer[256];
-    char *schemes[] = { "file://", "uuid://", "label://", "mtp://" };
-
-    snprintf(buffer, sizeof(buffer), "%s%s%s",
-            schemes[share->scheme],
-            share->authority ? share->authority : "",
-            share->path);
-
-    return buffer;
-}
-
 int
 main(int argc, char **argv)
 {