ws: fix compile error on centos 7 - very old compiler (libevent#1359)

* http: fix typo

* ws: fix comile error

On CentOS:

  CC       ws.lo
ws.c: In function 'get_ws_frame':
ws.c:244:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for (int i = 0; i < payload_len; i++) {
   ^
ws.c:244:3: note: use option -std=c99 or -std=gnu99 to compile your code

http.c

@@ -741,7 +741,7 @@ evhttp_connection_incoming_fail(struct evhttp_request *req,
 		 * case may happen when a browser keeps a persistent
 		 * connection open and we timeout on the read.  when
 		 * the request is still being used for sending, we
-		 * need to disassociated it from the connection here.
+		 * need to disassociate it from the connection here.
 		 */
 		if (!req->userdone) {
 			/* remove it so that it will not be freed */

test/regress_ws.c

@@ -144,6 +144,7 @@ receive_ws_msg(struct evbuffer *buf, size_t *out_len, unsigned *options)
 	const unsigned char *mask_key;
 	char *out_buf = NULL;
 	size_t data_len = evbuffer_get_length(buf);
+	size_t i;
 
 	data = evbuffer_pullup(buf, data_len);
 
@@ -177,7 +178,7 @@ receive_ws_msg(struct evbuffer *buf, size_t *out_len, unsigned *options)
 		return NULL;
 
 	mask_key = data + header_len - 4;
-	for (size_t i = 0; mask && i < payload_len; i++)
+	for (i = 0; mask && i < payload_len; i++)
 		data[header_len + i] ^= mask_key[i % 4];
 
 	*out_len = payload_len;
@@ -205,6 +206,7 @@ send_ws_msg(struct evbuffer *buf, const char *msg, bool final)
 	uint8_t a = 0, b = 0, c = 0, d = 0;
 	uint8_t mask_key[4] = {1, 2, 3, 4}; /* should be random */
 	uint8_t m;
+	size_t i;
 
 	if (final)
 		a |= 1 << 7; /* fin */
@@ -233,7 +235,7 @@ send_ws_msg(struct evbuffer *buf, const char *msg, bool final)
 
 	evbuffer_add(buf, &mask_key, 4);
 
-	for (size_t i = 0; i < len; i++) {
+	for (i = 0; i < len; i++) {
 		m = msg[i] ^ mask_key[i % 4];
 		evbuffer_add(buf, &m, 1);
 	}

ws.c

@@ -236,13 +236,14 @@ get_ws_frame(unsigned char *in_buffer, int buf_len, unsigned char **payload_ptr,
 	 */
 	if (masked) {
 		unsigned char *c;
+		int i;
 
 		mask = *((unsigned int *)(in_buffer + pos));
 		pos += 4;
 
 		/* unmask data */
 		c = in_buffer + pos;
-		for (int i = 0; i < payload_len; i++) {
+		for (i = 0; i < payload_len; i++) {
 			c[i] = c[i] ^ ((unsigned char *)(&mask))[i % 4];
 		}
 	}