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fix: add NULL pointer check in rcl_client_bindings.cpp (CWE-476) (#1613)

The CreateClient function allocates memory for rcl_client_t using malloc() without checking if the allocation succeeded. If malloc returns NULL due to memory exhaustion, the code immediately dereferences the NULL pointer, causing a segmentation fault and application crash. The affected code is `src/rcl_client_bindings.cpp:43`. This change is the fix I would apply.

Reference: [CWE-476](https://cwe.mitre.org/data/definitions/476.html)

Fixes #1616

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