Fix couple of memory leaks in PKCS7_dataDecode().

(provided by Stephen)

CHANGES

@@ -4,6 +4,9 @@
 
  Changes between 0.9.6 and 0.9.7  [xx XXX 2000]
 
+  *) Fix a couple of memory leaks in PKCS7_dataDecode()
+     [Steve Henson, reported by Heyun Zheng <hzheng@atdsprint.com>]
+
   *) Change Configure and Makefiles to provide EXE_EXT, which will contain
      the default extension for executables, if any.  Also, make the perl
      scripts that use symlink() to test if it really exists and use "cp"

crypto/pkcs7/pk7_doit.c

@@ -370,7 +370,7 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 		if (ri == NULL) {
 			PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 				 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
-			return(NULL);
+			goto err;
 		}
 
 		jj=EVP_PKEY_size(pkey);
@@ -393,7 +393,7 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 		BIO_get_cipher_ctx(etmp,&evp_ctx);
 		EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 		if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
-			return(NULL);
+			goto err;
 
 		if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 			/* Some S/MIME clients don't use the same key