bhyve: Need to add parameter to virDomainChrDefNew

Commit id '5f2a1327' missed this one.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

src/bhyve/bhyve_parse_command.c

@@ -287,7 +287,7 @@ bhyveParseBhyveLPCArg(virDomainDefPtr def,
 
     /* Only support com%d */
     if (STRPREFIX(type, "com") && type[4] == 0) {
-        if (!(chr = virDomainChrDefNew()))
+        if (!(chr = virDomainChrDefNew(NULL)))
             goto error;
 
         chr->source.type = VIR_DOMAIN_CHR_TYPE_NMDM;