[PATCH] Fix incorrect Unicode code point in saslprep.c comment

Hi,

While working on a new client (just a hobby, won't be big and professional like node-postgres), I noticed a small error in a comment in src/common/saslprep.c.

The comment for non_ascii_space_ranges states that non-ASCII space characters are mapped to U+00A0:

> * These are all mapped to the ASCII space character (U+00A0).

However, the actual implementation maps them to 0x0020 (ASCII SPACE):

> if (IS_CODE_IN_TABLE(code, non_ascii_space_ranges))
> input_chars[count++] = 0x0020;

The attached patch corrects the comment to refer to U+0020:

> - * These are all mapped to the ASCII space character (U+00A0).
> + * These are all mapped to the ASCII space character (U+0020).

The patch is against master and changes only a single bit in a comment, with no impact on functionality.

Best regards,
Robert I Nilsson