CLEANUP: Remove useless malloc() casts

This is not C++.
diff --git a/src/http_htx.c b/src/http_htx.c
index a7951c0..53732d1 100644
--- a/src/http_htx.c
+++ b/src/http_htx.c
@@ -909,7 +909,7 @@
 	}
 
 	buf->size = global.tune.bufsize;
-	buf->area = (char *)malloc(buf->size);
+	buf->area = malloc(buf->size);
 	if (!buf->area)
 		goto error;