qemu: gpu: Get pid without binary validation
qemu: gpu: Get pid without binary validation

The binary validation in virPidFileReadPathIfAlive may fail with EACCES
if the calling process does not have CAP_SYS_PTRACE capability.
Therefore instead do only the check that the pidfile is locked by the
correct process.

Fixes the same issue as with swtpm.

Signed-off-by: Vasiliy Ulyanov <874333a19fcb57a423921069a9d8e451d537235a@suse.de>
Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

olafhering/libvirt,crobinso/libvirt,libvirt/libvirt,zippy2/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,zippy2/libvirt,olafhering/libvirt,jfehlig/libvirt,olafhering/libvirt,olafhering/libvirt,zippy2/libvirt,crobinso/libvirt,jfehlig/libvirt,libvirt/libvirt,zippy2/libvirt,libvirt/libvirt,crobinso/libvirt,crobinso/libvirt