[RFA 09/14] Remove some cleanups from location.c

[Simon Marchi]

On 2017-04-08 16:12, Tom Tromey wrote:
> This removes some more cleanups from location.c by using
> unique_xmalloc_ptr.

I was going to ask if you considered using std::string, but when I tried 
it I realized the explicit_location class was not ready to receive 
std::strings yet.  When we get there, I think the 
string_to_explicit_location will gain a lot in readability.  So given 
the circumstances, this patch looks good to me.

Simon