Revert "acct_gather_profile/influxdb - detect out of memory on callback realloc."

This reverts commit 33596bc782f254ae56ab0f61fd736308b6980edf.

slurm_xrealloc will internally do this on new size allocation error:

log_oom(file, line, func);
abort();

so no need to manually handle it.

Bug 2693.