test/shader/vtest: Fix two memory leaks
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In geometry shaders emit_so_movs is called for each TGSI_OPCODE_EMIT, which may result in allocating the name for the emitted TF output more than once. Make sure we only allocate the name once.
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_mesa_hash_table_u64 uses "0" and "1" as special key, so entries with these keys must be handled separately
Edited by Gert Wollny