Fix a double free in ca command line

Providing a spkac file with no default section causes a double free.

Thanks to Brian Carpenter for reporting this issue.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>

apps/ca.c

diff --git a/apps/ca.c b/apps/ca.c
index b95f2ef..b6ab00a 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -1912,7 +1912,6 @@
     sk = CONF_get_section(parms, "default");
     if (sk_CONF_VALUE_num(sk) == 0) {
         BIO_printf(bio_err, "no name/value pairs found in %s\n", infile);
-        CONF_free(parms);
         goto end;
     }