Removed an unused variable and added a bit of error checking in read combining code.
Removed an unused variable and added a bit of error checking in read combining
code.

byterom/android_external_fuse,byterom/android_external_fuse,byterom/android_external_fuse,F-AOSP/platform_external_fuse,F-AOSP/platform_external_fuse,F-AOSP/platform_external_fuse