Dirty kludgery to fix rpmdeps segfault (RhBug:1131892)

- Another regression from the recent rpmfc work, in rpmdeps context
  there's no spec or packages from it. Allocate a dummy package so
  we have some place to store the dependencies. And yes its ugly.

build/rpmfc.c

@@ -739,6 +739,7 @@ rpmfc rpmfcFree(rpmfc fc)
 	free(fc->fattrs);
 	free(fc->fcolor);
 	free(fc->fcdictx);
+	free(fc->pkg);
 	argiFree(fc->fddictx);
 	argiFree(fc->fddictn);
 	argiFree(fc->ddictx);
@@ -761,6 +762,7 @@ rpmfc rpmfcCreate(const char *buildRoot, rpmFlags flags)
 	fc->brlen = strlen(buildRoot);
     }
     fc->pool = rpmstrPoolCreate();
+    fc->pkg = xcalloc(1, sizeof(*fc->pkg));
     return fc;
 }
 
@@ -1261,6 +1263,7 @@ rpmRC rpmfcGenerateDepends(const rpmSpec spec, Package pkg)
     av[ac] = NULL;
 
     fc = rpmfcCreate(spec->buildRoot, 0);
+    free(fc->pkg);
     fc->pkg = pkg;
     fc->skipProv = !pkg->autoProv;
     fc->skipReq = !pkg->autoReq;
@@ -1334,6 +1337,8 @@ exit:
     printDeps(fc);
 
     /* Clean up. */
+    if (fc)
+	fc->pkg = NULL;
     free(fmode);
     rpmfcFree(fc);
     argvFree(av);