docs/examples: adjust prototypes for CURLOPT_READFUNCTION

The type of the buffer in curl_read_callback is 'char *', not 'void *'.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Closes #6392

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/examples/post-callback.c b/docs/examples/post-callback.c
index 9ee3f9a23..f9c816036 100644
--- a/docs/examples/post-callback.c
+++ b/docs/examples/post-callback.c
@@ -41,7 +41,7 @@ struct WriteThis {
   size_t sizeleft;
 };
 
-static size_t read_callback(void *dest, size_t size, size_t nmemb, void *userp)
+static size_t read_callback(char *dest, size_t size, size_t nmemb, void *userp)
 {
   struct WriteThis *wt = (struct WriteThis *)userp;
   size_t buffer_size = size*nmemb;