Fix useless assert(true) (which would never fire)

...and simplify the code a bit.  It had been introduced with
0a1d5af2a18d6a062c45d65689fbce619922dcc8 "tdf#115429 sax: assert if exporting an
invalid XML attribute/element", apparently meant to be an assert(false) instead.
A `make check screenshot` didn't cause the (now active) assert to fire in my
local build.

Change-Id: I275661f290491ff2d094288522f98d77cb4662ec
Reviewed-on: https://gerrit.libreoffice.org/82631
Reviewed-by: Michael Stahl <michael.stahl@cib.de>
Tested-by: Jenkins

0 files changed, 0 insertions, 0 deletions