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/imap-append.c b/docs/examples/imap-append.c
index 09287a441..9c045710a 100644
--- a/docs/examples/imap-append.c
+++ b/docs/examples/imap-append.c
@@ -59,7 +59,7 @@ struct upload_status {
   int lines_read;
 };
 
-static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
+static size_t payload_source(char *ptr, size_t size, size_t nmemb, void *userp)
 {
   struct upload_status *upload_ctx = (struct upload_status *)userp;
   const char *data;