por-file-reader: Use xasprintf() to avoid need for careful buffer sizing.
authorBen Pfaff <blp@cs.stanford.edu>
Wed, 2 Jan 2019 22:26:24 +0000 (14:26 -0800)
committerBen Pfaff <blp@cs.stanford.edu>
Wed, 2 Jan 2019 22:50:14 +0000 (14:50 -0800)
GCC 4.9 complained about this, saying that the output could exceed the
buffer size.  It doesn't seem worth arguing with it.


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