- fixed some minor comment issues

Source/charon/transforms/hmac.c

@@ -157,7 +157,7 @@ static status_t set_key(private_hmac_t *this, chunk_t key)
 		this->opaded_key.ptr[i] = buffer[i] ^ 0x5C;
 	}
 	
-	/* begin hashing if inner pad */
+	/* begin hashing of inner pad */
 	this->h->reset(this->h);
 	this->h->get_hash(this->h, this->ipaded_key, NULL);
 	

Source/charon/transforms/prf_plus.c

@@ -76,7 +76,7 @@ static status_t get_bytes(private_prf_plus_t *this, size_t length, u_int8_t *buf
 	appending_chunk.ptr = &(this->appending_octet);
 	appending_chunk.len = 1;
 	
-	while (length)
+	while (length > 0)
 	{	/* still more to do... */
 		if (this->buffer.len == this->given_out)
 		{	/* no bytes left in buffer, get next*/