Early return for zero size calls to get_tensor. (llama/5482)

Early return for zero size calls to get_tensor. (llama/5482)

* Early return for zero size calls to get_tensor.

Signed-off-by: Adam Treat <redacted>
* Update ggml-kompute.cpp

Co-authored-by: Georgi Gerganov <redacted>
* Update ggml-kompute.cpp

Co-authored-by: Georgi Gerganov <redacted>
* Add an early return to the get/set tensor when the size is null.

Signed-off-by: Adam Treat <redacted>
* Early return after the assertions.

Signed-off-by: Adam Treat <redacted>
* Since we do the early return in the generic backend now no reason to do so here as well.

Signed-off-by: Adam Treat <redacted>
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Signed-off-by: Adam Treat <redacted>
Co-authored-by: Georgi Gerganov <redacted>