RT3140: Possibly-unit variable in pem_lib.c

Can't really happen, but the flow of control isn't obvious.
Add an initializer.
Reviewed-by: NMatt Caswell <matt@openssl.org>

crypto/pem/pem_lib.c

@@ -443,7 +443,7 @@ err:
 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 	     pem_password_cb *callback,void *u)
 	{
-	int i,j,o,klen;
+	int i=0,j,o,klen;
 	long len;
 	EVP_CIPHER_CTX ctx;
 	unsigned char key[EVP_MAX_KEY_LENGTH];