Get rid of MG_ENABLE_LOG, change mg_hexdump()

test/fuzz.c

@@ -7,6 +7,8 @@ int LLVMFuzzerTestOneInput(const uint8_t *, size_t);
 #endif
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  mg_log_set("0");
+
   struct mg_dns_message dm;
   mg_dns_parse(data, size, &dm);
   mg_dns_parse(NULL, 0, &dm);
@@ -36,9 +38,6 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   mg_base64_encode(data, (int) size, buf);
   mg_base64_encode(NULL, 0, buf);
 
-  char *hexdump = mg_hexdump(data, size);
-  free(hexdump);
-
   mg_globmatch((char *) data, size, (char *) data, size);
 
   struct mg_str k, v, s = mg_str_n((char *) data, size);

test/unit_test.c

@@ -1426,13 +1426,11 @@ static void test_dns(void) {
 }
 
 static void test_util(void) {
-  char buf[100], *s = mg_hexdump("abc", 3), *p;
+  char buf[100], *p, *s;
   struct mg_addr a;
-  ASSERT(s != NULL);
-  free(s);
   memset(&a, 0, sizeof(a));
   ASSERT(mg_file_printf(&mg_fs_posix, "data.txt", "%s", "hi") == true);
-  if (system("ls -l") != 0) (void) 0;
+  // if (system("ls -l") != 0) (void) 0;
   ASSERT((p = mg_file_read(&mg_fs_posix, "data.txt", NULL)) != NULL);
   ASSERT(strcmp(p, "hi") == 0);
   free(p);