uat_load() and uat_save() return a success indication; use it.

Instead of always ignoring the return value, always check it, and only
report an error if it returns FALSE.

(Alternative: have it return NULL on success and a pointer to a
g_malloc()ed string on failure.)

Fix a comment while we're at it.

Change-Id: Icb72c9f47775b6552e3eb4fe5ddcc85482bfb5fb
Reviewed-on: https://code.wireshark.org/review/6528
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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