restore: fix index for accessing entries of the parent_act array

SIGMAX is a valid value, but the 0 signal doesn't exist.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-restore.c

@@ -682,7 +682,7 @@ static int prepare_sigactions(void)
 			continue;
 		}
 
-		if (sa_inherited(sig, &act))
+		if (sa_inherited(sig - 1, &act))
 			continue;
 
 		/*
@@ -695,7 +695,7 @@ static int prepare_sigactions(void)
 			goto err;
 		}
 
-		parent_act[sig] = act;
+		parent_act[sig - 1] = act;
 		rst++;
 	}