FAT: get_fatent: Fix FAT boundary check

startblock must be taken into account in order not to read past the
end of the FAT.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 9f83572..87a1623 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -207,8 +207,8 @@
 		__u32 fatlength = mydata->fatlength;
 		__u32 startblock = bufnum * FATBUFBLOCKS;
 
-		if (getsize > fatlength)
-			getsize = fatlength;
+		if (startblock + getsize > fatlength)
+			getsize = fatlength - startblock;
 
 		fatlength *= mydata->sect_size;	/* We want it in bytes now */
 		startblock += mydata->fat_sect;	/* Offset from start of disk */