qemu: initialize variables in qemuParseCommandLine
qemu: initialize variables in qemuParseCommandLine

Commit 6700062 introduced a jump to error which skipped the
initialization of def:

qemu/qemu_parse_command.c:1870:9: error: variable 'def' is
used uninitialized whenever 'if' condition is true
      [-Werror,-Wsometimes-uninitialized]
    if (!(qemuCaps = virQEMUCapsCacheLookup(capsCache, progargv[0])))

Initialize def to fix this warning and qemuCaps, to prevent
a future error like this.

Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

nertpinx/libvirt,nertpinx/libvirt,libvirt/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,crobinso/libvirt,nertpinx/libvirt,eskultety/libvirt,zippy2/libvirt,crobinso/libvirt,fabianfreyer/libvirt,crobinso/libvirt,crobinso/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,zippy2/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,libvirt/libvirt,andreabolognani/libvirt,zippy2/libvirt,olafhering/libvirt,eskultety/libvirt,eskultety/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,zippy2/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,eskultety/libvirt,olafhering/libvirt,nertpinx/libvirt,jardasgit/libvirt,andreabolognani/libvirt,nertpinx/libvirt,olafhering/libvirt