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/libsparse/output_file.c b/libsparse/output_file.c
index 2428022..a28b0a5 100644
--- a/libsparse/output_file.c
+++ b/libsparse/output_file.c
@@ -722,10 +722,12 @@
 	}
 	pos = lseek64(fd, offset, SEEK_SET);
 	if (pos < 0) {
+                free(data);
 		return -errno;
 	}
 	ret = read_all(fd, data, len);
 	if (ret < 0) {
+                free(data);
 		return ret;
 	}
 	ptr = data;