samples/net/http_client: Cast size_t to int to avoid compiler warnings

Cast size_t to int in the http_client_cb code.

Jira:  ZEP-1872
Change-Id: I36133da953669ec133421b5e7fb21bec9807fd06
Signed-off-by: Flavio Santes <[email protected]>
(cherry picked from commit 4b92c9014e931680aa074d0eeaea9ffca4493d3b)

Author: 1010101001010101

samples/net/http_client/src/http_client_cb.c

@@ -16,7 +16,7 @@ int on_url(struct http_parser *parser, const char *at, size_t length)
 {
 	ARG_UNUSED(parser);
 
-	printf("URL: %.*s\n", length, at);
+	printf("URL: %.*s\n", (int)length, at);
 
 	return 0;
 }
@@ -49,7 +49,7 @@ int on_header_field(struct http_parser *parser, const char *at, size_t length)
 		ctx->cl_present = 1;
 	}
 
-	printf("%.*s: ", length, at);
+	printf("%.*s: ", (int)length, at);
 
 	return 0;
 }
@@ -78,7 +78,7 @@ int on_header_value(struct http_parser *parser, const char *at, size_t length)
 		ctx->cl_present = 0;
 	}
 
-	printf("%.*s\n", length, at);
+	printf("%.*s\n", (int)length, at);
 
 	return 0;
 }