MINOR: buffer: make b_getblk_nc() take size_t for the block sizes

Till now we used to reimplement it using ints to limit external changes
but we must adjust it and the various users to switch to size_t.
diff --git a/src/hlua.c b/src/hlua.c
index eb27ebc..7976242 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -1736,12 +1736,12 @@
 	int wanted = lua_tointeger(L, 2);
 	struct hlua *hlua = hlua_gethlua(L);
 	struct appctx *appctx;
-	int len;
+	size_t len;
 	int nblk;
 	const char *blk1;
-	int len1;
+	size_t len1;
 	const char *blk2;
-	int len2;
+	size_t len2;
 	int skip_at_end = 0;
 	struct channel *oc;
 	struct stream_interface *si;
@@ -2774,8 +2774,8 @@
 {
 	char *blk1;
 	char *blk2;
-	int len1;
-	int len2;
+	size_t len1;
+	size_t len2;
 	int ret;
 	luaL_Buffer b;
 
@@ -2862,9 +2862,9 @@
 {
 	char *blk1;
 	char *blk2;
-	int len1;
-	int len2;
-	int len;
+	size_t len1;
+	size_t len2;
+	size_t len;
 	struct channel *chn;
 	int ret;
 	luaL_Buffer b;
@@ -3634,9 +3634,9 @@
 	struct stream_interface *si = appctx->appctx->owner;
 	int ret;
 	const char *blk1;
-	int len1;
+	size_t len1;
 	const char *blk2;
-	int len2;
+	size_t len2;
 
 	/* Read the maximum amount of data avalaible. */
 	ret = co_getline_nc(si_oc(si), &blk1, &len1, &blk2, &len2);
@@ -3686,12 +3686,12 @@
 {
 	struct hlua_appctx *appctx = MAY_LJMP(hlua_checkapplet_tcp(L, 1));
 	struct stream_interface *si = appctx->appctx->owner;
-	int len = MAY_LJMP(luaL_checkinteger(L, 2));
+	size_t len = MAY_LJMP(luaL_checkinteger(L, 2));
 	int ret;
 	const char *blk1;
-	int len1;
+	size_t len1;
 	const char *blk2;
-	int len2;
+	size_t len2;
 
 	/* Read the maximum amount of data avalaible. */
 	ret = co_getblk_nc(si_oc(si), &blk1, &len1, &blk2, &len2);
@@ -4097,9 +4097,9 @@
 	struct channel *chn = si_ic(si);
 	int ret;
 	const char *blk1;
-	int len1;
+	size_t len1;
 	const char *blk2;
-	int len2;
+	size_t len2;
 
 	/* Maybe we cant send a 100-continue ? */
 	if (appctx->appctx->ctx.hlua_apphttp.flags & APPLET_100C) {
@@ -4183,9 +4183,9 @@
 	struct channel *chn = si_ic(si);
 	int ret;
 	const char *blk1;
-	int len1;
+	size_t len1;
 	const char *blk2;
-	int len2;
+	size_t len2;
 
 	/* Maybe we cant send a 100-continue ? */
 	if (appctx->appctx->ctx.hlua_apphttp.flags & APPLET_100C) {
@@ -6627,9 +6627,9 @@
 	struct proxy *px = strm->be;
 	struct hlua *hlua = ctx->ctx.hlua_apphttp.hlua;
 	const char *blk1;
-	int len1;
+	size_t len1;
 	const char *blk2;
-	int len2;
+	size_t len2;
 	int ret;
 
 	/* If the stream is disconnect or closed, ldo nothing. */