asprintf.c: remove the ending superfluous comma in a macro

c-programming/strings/asprintf.c

@@ -44,7 +44,7 @@ ssize_t asprintf(char** strp, char* format, ...) {
     printf("[test] " caption ": %s\n", test_result ? "OK" : "failed");        \
     if (test_result == false)                                                 \
         exit(EXIT_FAILURE);                                                   \
-} while (0);
+} while (0)
 
 int main(void) {
 	const char* world = " world";