[warnings] add -Wshadow which helps detect local variables that override globals
Nothing particularly bad showed up but cleaned up a bit of code.
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@@ -101,7 +101,7 @@ static void zynq_common_target_init(uint level) {
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/* we were loaded from spi flash, go look at it to see if we can find it */
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if (spi) {
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void *ptr = 0;
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int err = bio_ioctl(spi, BIO_IOCTL_GET_MEM_MAP, (void *)&ptr);
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err = bio_ioctl(spi, BIO_IOCTL_GET_MEM_MAP, (void *)&ptr);
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if (err >= 0) {
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put_bio_memmap = true;
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ptr = (uint8_t *)ptr + bootimage_phys;
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