explicitly cast getchar return

src/dyninput.c

@@ -29,6 +29,7 @@ char* dyninput_str(int_least64_t maxsize)
     {
         c = getchar();
         if (i + 2 == size)
+		c = (char)getchar();
 		if (i + 1 == size)
         {
             char* tmp = realloc(str, size + 1);