PKCS#7: fix unitialized boolean 'want'

The boolean want is not initialized and hence garbage. The default should
be false (later it is only set to true on tne sinfo->authattrs check).

Found with static analysis using CoverityScan

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/crypto/asymmetric_keys/pkcs7_parser.c b/crypto/asymmetric_keys/pkcs7_parser.c
index 3ef62da..cbbd03f 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.c
+++ b/crypto/asymmetric_keys/pkcs7_parser.c
@@ -87,7 +87,7 @@
 static int pkcs7_check_authattrs(struct pkcs7_message *msg)
 {
 	struct pkcs7_signed_info *sinfo;
-	bool want;
+	bool want = false;
 
 	sinfo = msg->signed_infos;
 	if (sinfo->authattrs) {