dhcp: Don't use signed char for DHCP options
The value of DHCP_OPTEND is 255. When it is assigned this result in a sign change as the positive int constant is cast to a signed char and -1 results. Clang 4.0 complains about this.
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@ -176,7 +176,7 @@ typedef struct __attribute__((packed)) {
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char server_hostname[64];
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char boot_filename[128];
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uint32_t magic_cookie;
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char options[252];
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u_char options[252];
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} dhcp_t;
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/**
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