use alloc_ref rather than hand-allocating "struct ref"

diff --git a/imap-send.c b/imap-send.c
index 37ac4aa86a740ecc8430afff3b9d3c7a0c753a34..e9faaeaf2ab31413139dad17c6df1032e7e3cffa 100644 (file)
--- a/imap-send.c
+++ b/imap-send.c
@@ -889,9 +889,8 @@ static char *cram(const char *challenge_64, const char *user, const char *pass)
        }
 
        /* response: "<user> <digest in hex>" */
-       resp_len = strlen(user) + 1 + strlen(hex) + 1;
-       response = xmalloc(resp_len);
-       sprintf(response, "%s %s", user, hex);
+       response = xstrfmt("%s %s", user, hex);
+       resp_len = strlen(response) + 1;
 
        response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
        encoded_len = EVP_EncodeBlock((unsigned char *)response_64,