Add error case for creating unspecified map type. #974
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When creating a new map, if the the map type is unspecified (i.e. BPF_MAP_TYPE_UNSPEC) then the call to create the map will fail with EINVAL and the following Go error is returned due to the btf file descriptor being zerod out:
...: map create: ... (without BTF k/v)
Instead, upon failure to create me, this will now check if the map type was set to unspecified and return a relevant error.