CVE-2026-72156 fpga: microchip-spi: fix zero header_size OOB read in mpf_ops_parse_header()

In the Linux kernel, the following vulnerability has been resolved: fpga: microchip-spi: fix zero headersize OOB read in mpfopsparseheader mpfopsparseheader reads headersize from the bitstream at MPFHEADERSIZEOFFSET 24. When headersize is zero, the expression buf + headersize - 1 reads one byte...