ARM: Fix decompressor's kernel size estimation for ROM=y
Commit 2552fc27 changed the way the decompressor decides if it is safe to decompress the kernel directly to its final location. Unfortunately, it took the top of the compressed data as being the stack pointer, which it is for ROM=n cases. However, for ROM=y, the stack pointer is not relevant, and results in the wrong answer. Fix this by explicitly storing the end of the biggybacked data in the decompressor, and use that to calculate the compressed image size. CC: <stable@kernel.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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