flash_image.c: fix clang build
#1045
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Without the change the build fails on `clang as:
/build/bladeRF/host/utilities/bladeRF-cli/src/cmd/flash_image.c:71:35:
error: overlapping comparisons always evaluate to true [-Werror,-Wtautological-overlap-compare]
71 | if (val[i] >= 'a' || val[i] <= 'f') {
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
I think it flags real error. Let's use `&&` to catch the range.
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Without the change the build fails on `clang as:
I think it flags real error. Let's use
&&to catch the range.