apt-pkg/pkgcachegen.cc: fix compiler error

apt-pkg/pkgcachegen.cc

@@ -648,7 +648,7 @@ bool pkgCacheGenerator::FinishCache(OpProgress *Progress)
 	       bool const coInstall = ((V->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same);
 	       for (vector<string>::const_iterator A = archs.begin(); A != archs.end(); ++A)
 	       {
-		  if (Arch == 0 || *A == Arch)
+		  if (*A == Arch)
 		     continue;
 		  /* We allow only one installed arch at the time
 		     per group, therefore each group member conflicts