Fix a bunch of small system/core bugs.

Missing frees in:
  adb/file_sync_client.c
  fastboot/fastboot.c
  libsparse/output_file.c

Missing closedirs in:
  adb/file_sync_service.c
  cpio/mkbootfs.c
  libcutils/dir_hash.c

Potential buffer overrun in:
  gpttool/gpttool.c

Incorrect NULL check in:
  libsparse/backed_block.c

Bug: https://code.google.com/p/android/issues/detail?id=61564
Change-Id: If97838a9e73a77aef7f416c31c237ce1fca4ce21
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index f339988..b9b3c92 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -21,6 +21,7 @@
 LOCAL_SRC_FILES := protocol.c engine.c bootimg.c fastboot.c util.c
 LOCAL_MODULE := fastboot
 LOCAL_MODULE_TAGS := debug
+LOCAL_CFLAGS += -std=gnu99
 
 ifeq ($(HOST_OS),linux)
   LOCAL_SRC_FILES += usb_linux.c util_linux.c