Fix use of unitialized ret in rsa.c
@@ -574,7 +574,7 @@ static int mgf_mask( unsigned char *dst, size_t dlen, unsigned char *src,
unsigned char *p;
unsigned int hlen;
size_t i, use_len;
- int ret;
+ int ret = 0;
memset( mask, 0, MBEDTLS_MD_MAX_SIZE );
memset( counter, 0, 4 );
