Signed int is used to store the random seed instead of unsigned

[axim2]

Prerequisites

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• I am running the latest code. Development is very rapid so there are no tagged versions as of now.
• I carefully followed the README.md.
• I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• I reviewed the Discussions, and have a new bug or useful enhancement to share.

Expected Behavior

Random seed should be stored as uint32_t.

Current Behavior

I've discovered the issue while developing an UI for llama.cpp (https://github.com/axim2/llm-ui): a big enough seed is interpreted as a negative number which leads llama.cpp to generate a new seed instead of using the given one.

main also crashes with core dump if seed over 2^31 is given to it on the command line.

Currently seed = -1 in gpt_params is used to indicate that a new random seed is needed, this can be replaced by having an additional parameter to llama_init_from_file(). Then the seed can be stored as uint32_t without issues.

[axim2]

Closing the issue since #2006 was merged