Only do save_errno = errno and errno = save_errno around g_free();

There is *no* need to do it around an assignment statement.  (We
*probably* don't need to do it around g_free(), but better safe than
sorry - maybe some memory allocator makes system calls to hand regions
of the address space back.)

Change-Id: Ib57540cc36b505aadf4a5e8885b9a744a35b1f75
Reviewed-on: https://code.wireshark.org/review/20236
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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