tree ad461207558d0452455a8180cf5d8b1e6e37d0be
parent 63295f1f7fa052fabcb4d69d49203cf33a7deef0
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1591729921 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1591729921 -0300

Avoid calling 'fprintf' with NULL

Avoid undefined behavior in calls like «fprintf("%s", NULL)».
('lua_writestringerror' is implemented as 'fprintf', and 'lua_tostring'
can return NULL if object is not a string.)