libxl: fix double-free of libxl_domain_build_info
libxl: fix double-free of libxl_domain_build_info

On error, libxlMakeDomBuildInfo() frees the caller-provided
libxl_domain_build_info struct embedded in libxl_domain_config,
causing a segfault

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f9c13020700 (LWP 40988)]
(gdb) bt
0  0x00007f9c162f95b4 in free () from /lib64/libc.so.6
1  0x00007f9c0d0965ad in libxl_bitmap_dispose () from
   /usr/lib64/libxenlight.so.4.4
2  0x00007f9c0d0a73bf in libxl_domain_build_info_dispose ()
   from /usr/lib64/libxenlight.so.4.4
3  0x00007f9c0d0a7974 in libxl_domain_config_dispose () from
   /usr/lib64/libxenlight.so.4.4
4  0x00007f9c0d2e00c5 in libxlDomainStart (driver=0x7f9c0400e4e0,
   vm=0x7f9c0412b0d0, start_paused=false, restore_fd=-1) at
   libxl/libxl_domain.c:1323
5  0x00007f9c0d2e1d4b in libxlDomainCreateXML (conn=0x7f9c000009a0,...)
   at libxl/libxl_driver.c:660

Remove the call to libxl_domain_build_info_dispose() from
libxlMakeDomBuildInfo().  On error, callers will dispose the
libxl_domain_config object, which in turn disposes the build info.

datto/libvirt,jfehlig/libvirt,elmarco/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,jardasgit/libvirt,zippy2/libvirt,olafhering/libvirt,VenkatDatta/libvirt,zippy2/libvirt,VenkatDatta/libvirt,datto/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,datto/libvirt,libvirt/libvirt,eskultety/libvirt,fabianfreyer/libvirt,agx/libvirt,agx/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,elmarco/libvirt,crobinso/libvirt,shugaoye/libvirt,rlaager/libvirt,olafhering/libvirt,eskultety/libvirt,jfehlig/libvirt,eskultety/libvirt,libvirt/libvirt,eskultety/libvirt,andreabolognani/libvirt,taget/libvirt,fabianfreyer/libvirt,elmarco/libvirt,taget/libvirt,datto/libvirt,taget/libvirt,datto/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,nertpinx/libvirt,zippy2/libvirt,agx/libvirt,rlaager/libvirt,jardasgit/libvirt,shugaoye/libvirt,shugaoye/libvirt,rlaager/libvirt,shugaoye/libvirt,andreabolognani/libvirt,rlaager/libvirt,jfehlig/libvirt,zippy2/libvirt,andreabolognani/libvirt,olafhering/libvirt,libvirt/libvirt,elmarco/libvirt,agx/libvirt,taget/libvirt,crobinso/libvirt,rlaager/libvirt,jardasgit/libvirt,elmarco/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,crobinso/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,eskultety/libvirt,jardasgit/libvirt,crobinso/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,olafhering/libvirt,taget/libvirt,agx/libvirt