tp_call.h fix field type for tracepoint event rclcpp_ring_buffer_enqueue (backport #117)

[mergify]

Reason for this pull request:

While trying to compile ros2 on my system with gcc-14 i got an integer conversion warning causing a compilation failure:

error: initialization of ‘const uint64_t *’ {aka ‘const long unsigned int *’} from ‘uint64_t’ {aka ‘long unsigned int’} makes pointer from integer without a cast [-Wint-conversion]
  474 |     ctf_integer(const uint64_t *, index, index_arg)

Proposed fix:

As far as i see it, the field type should match the argument type in this case.

After applying the proposed fix locally, the compilation succeeded.

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This is an automatic backport of pull request #117 done by [Mergify](https://mergify.com).

[christophebedard]

• Linux
• Linux-aarch64
• Linux-rhel
• Windows