CLEANUP: http: rename http_process_request_body()

This function does not process anything, it just waits for the beginning
of the request body. Let's rename it http_wait_for_request_body().
diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index c836eb4..1b6284b 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -70,7 +70,7 @@
 int http_process_req_common(struct session *s, struct channel *req, int an_bit, struct proxy *px);
 int http_process_request(struct session *t, struct channel *req, int an_bit);
 int http_process_tarpit(struct session *s, struct channel *req, int an_bit);
-int http_process_request_body(struct session *s, struct channel *req, int an_bit);
+int http_wait_for_request_body(struct session *s, struct channel *req, int an_bit);
 int http_send_name_header(struct http_txn *txn, struct proxy* be, const char* svr_name);
 int http_wait_for_response(struct session *s, struct channel *rep, int an_bit);
 int http_process_res_common(struct session *t, struct channel *rep, int an_bit, struct proxy *px);
diff --git a/src/proto_http.c b/src/proto_http.c
index ccc3ff2..93cf033 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -4278,13 +4278,16 @@
 	return 0;
 }
 
-/* This function is an analyser which processes the HTTP request body. It looks
- * for parameters to be used for the load balancing algorithm (url_param). It
- * must only be called after the standard HTTP request processing has occurred,
- * because it expects the request to be parsed. It returns zero if it needs to
- * read more data, or 1 once it has completed its analysis.
+/* This function is an analyser which waits for the HTTP request body. It waits
+ * for either the buffer to be full, or the full advertised contents to have
+ * reached the buffer. It must only be called after the standard HTTP request
+ * processing has occurred, because it expects the request to be parsed and will
+ * look for the Expect header. It may send a 100-Continue interim response. It
+ * takes in input any state starting from HTTP_MSG_BODY and leaves with one of
+ * HTTP_MSG_CHK_SIZE, HTTP_MSG_DATA or HTTP_MSG_TRAILERS. It returns zero if it
+ * needs to read more data, or 1 once it has completed its analysis.
  */
-int http_process_request_body(struct session *s, struct channel *req, int an_bit)
+int http_wait_for_request_body(struct session *s, struct channel *req, int an_bit)
 {
 	struct http_txn *txn = &s->txn;
 	struct http_msg *msg = &s->txn.req;
diff --git a/src/session.c b/src/session.c
index b85f554..753d6cc 100644
--- a/src/session.c
+++ b/src/session.c
@@ -1897,7 +1897,7 @@
 				}
 
 				if (ana_list & AN_REQ_HTTP_BODY) {
-					if (!http_process_request_body(s, s->req, AN_REQ_HTTP_BODY))
+					if (!http_wait_for_request_body(s, s->req, AN_REQ_HTTP_BODY))
 						break;
 					UPDATE_ANALYSERS(s->req->analysers, ana_list, ana_back, AN_REQ_HTTP_BODY);
 				}