Remove goto-based error handling in pdffonts.cc

Now that globalParams is a unique_ptr, there is no need
for these gotos anymore.
6 jobs for make-globalparams-unique in 4 minutes and 56 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #915507
build

00:03:44

passed #915512
build_android

00:01:26

passed #915508
build_clang_libcpp

00:03:48

passed #915511
build_clazy

00:04:54

passed #915510
build_mingw64_fedora

00:02:35

passed #915509
build_ubuntu_16_04

00:02:05