vdso: x86 -- Fix missing ability to remap vDSO if only one zone present

Occasionally I ruined the ability to do a in-place remap for
pre 3.16 kernels. Bring it back.

CID 1230182:  Logically dead code  (DEADCODE)
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/x86/vdso-pie.c

@@ -357,7 +357,8 @@ int vdso_proxify(char *who, struct vdso_symtable *sym_rt,
 
 					remap_rt = (delta_rt ^ delta_this) < 0 ? false : true;
 				}
-			}
+			} else
+				remap_rt = true;
 		}
 	}