[monitoring-plugins] Fix -Wcast-function-type compiler warnings

[RincewindsHat]

 Module: monitoring-plugins
 Branch: master
 Commit: fa3b80ce7d6879a327a4dd57c86209f0b975c295
 Author: RincewindsHat <12514511+RincewindsHat at users.noreply.github.com>
   Date: Sun Oct 15 15:10:27 2023 +0200
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=fa3b80c

Fix -Wcast-function-type compiler warnings

---

 plugins/check_curl.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index d0871c4..d3d0199 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -239,10 +239,10 @@ void print_help (void);
 void print_usage (void);
 void print_curl_version (void);
 int curlhelp_initwritebuffer (curlhelp_write_curlbuf*);
-int curlhelp_buffer_write_callback (void*, size_t , size_t , void*);
+size_t curlhelp_buffer_write_callback(void*, size_t , size_t , void*);
 void curlhelp_freewritebuffer (curlhelp_write_curlbuf*);
 int curlhelp_initreadbuffer (curlhelp_read_curlbuf *, const char *, size_t);
-int curlhelp_buffer_read_callback (void *, size_t , size_t , void *);
+size_t curlhelp_buffer_read_callback(void *, size_t , size_t , void *);
 void curlhelp_freereadbuffer (curlhelp_read_curlbuf *);
 curlhelp_ssl_library curlhelp_get_ssl_library ();
 const char* curlhelp_get_ssl_library_string (curlhelp_ssl_library);
@@ -2171,8 +2171,7 @@ curlhelp_initwritebuffer (curlhelp_write_curlbuf *buf)
   return 0;
 }
 
-int
-curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *stream)
+size_t curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *stream)
 {
   curlhelp_write_curlbuf *buf = (curlhelp_write_curlbuf *)stream;
 
@@ -2192,8 +2191,7 @@ curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *s
   return (int)(size * nmemb);
 }
 
-int
-curlhelp_buffer_read_callback (void *buffer, size_t size, size_t nmemb, void *stream)
+size_t curlhelp_buffer_read_callback(void *buffer, size_t size, size_t nmemb, void *stream)
 {
   curlhelp_read_curlbuf *buf = (curlhelp_read_curlbuf *)stream;