1) In skin(), only add a space after a comma if there is actually a space

in the input buffer.  This prevents a rare buffer overflow on very long
header lines where one or more entries has a comment in it but the
entries have no space after the comma *and* the amount of extra space
needed to add a space after each comma is greater than the length of
the comments that will be removed.  This is debian bug #108677

2) In skin(), use a temporary variable in the realloc() and don't
die if realloc() fails since its only purpose is to shrink the
buffer, not expand it (and thus is not fatal).

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