Add aosp patch to fix filesystem check fail when mounting.

Modify files:
1. external/fsck_msdos/check.c

Root Cause:
  fsck_msdos will return 4 after repairing file system on An P.
  After An Q, this action become return 8, which lead to file system
  check failed.

Solution:
  We manually change return value to 4 to resolve this issue.
  when return value is 4, vold will retry fsck multiple time,
  so we don't have to unplug and plug the device.

Test:
1. build pass.

Bug: 186611822

Change-Id: I9780b4b894463780b179cf0f6042883df0a12a71

1 files changed, 3 insertions, 1 deletions

diff --git a/check.c b/check.c
index 9519315..c164316 100644
--- a/check.c
+++ b/check.c
@@ -186,8 +186,10 @@ checkfilesys(const char *fname)
 	free(fat);
 	close(dosfs);
 
-	if (mod & (FSFATMOD|FSDIRMOD))
+	if (mod & (FSFATMOD|FSDIRMOD)){
 		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
+		return 4;
+	}
 
 	return ret;
 }