make it compile warning-free and free() the memory before exit

docs/examples/getinmemory.c

@@ -14,6 +14,8 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 #include <curl/curl.h>
 #include <curl/types.h>
@@ -93,5 +95,8 @@ int main(int argc, char **argv)
    * you're done with it, you should free() it as a nice application.
    */
 
+  if(chunk.memory)
+    free(chunk.memory);
+
   return 0;
 }