other inits have moved to not requiring the -h flag when used with -H/-P.
modify sysvinit to be the same since it really doesn't matter.

https://bugs.gentoo.org/449354

patch by Doug Goldstein

--- sysvinit-3.10/man/shutdown.8
+++ sysvinit-3.10/man/shutdown.8
@@ -66,24 +66,19 @@
 .\"}}}
 .\"{{{  -h
 .IP \fB\-h\fP
-Halt or power off after shutdown.
-Usually used with the \fB\-P\fP or \fB\-H\fP flags,
-depending on whether we want to poweroff or
-simply stop the operating system.
+Equivalent to \fI-P\fP, unless \fI-H\fP is specified.
 .\"}}}
 .\"{{{  -P
 .IP \fB\-P\fP
-Modifier to the \fB\-h\fP flag. Halt action is to turn off the power.
-Must be used with the \fB\-h\fP flag.
+Halt action is to turn off the power.
 .\"}}}
 .\"{{{  -H
 .IP \fB\-H\fP
-Modifier to the \fB\-h\fP flag.  Halt action is to halt or drop into boot
-monitor on systems that support it.  Must be used with the \fB\-h\fP flag.
+Action is to halt or drop into boot monitor on systems that support it.
 Halting is often used to run through the shutdown process and leave
 output on the screen for debugging purposes. Or when the user wants the OS to
 stop, but leave the power on. To power off at the end of the shutdown sequence
-use the \fB\-P\fP modifier instead.
+use the \fB\-P\fP option instead.
 .\"}}}
 .\"{{{  -f
 .IP \fB\-f\fP
--- sysvinit-3.10/src/shutdown.c
+++ sysvinit-3.10/src/shutdown.c
@@ -144,9 +144,7 @@
 	"\t\t  -r:      reboot after shutdown.\n"
 	"\t\t  -h:      halt after shutdown.\n"
 	"\t\t  -P:      halt action is to turn off power.\n"
-        "\t\t           can only be used along with -h flag.\n"
 	"\t\t  -H:      halt action is to just halt.\n"
-        "\t\t           can only be used along with -h flag.\n"
 	"\t\t  -f:      do a 'fast' reboot (skip fsck).\n"
 	"\t\t  -F:      Force fsck on reboot.\n"
 	"\t\t  -n:      do not go through \"init\" but go down real fast.\n"
@@ -556,9 +554,11 @@
   		switch(c) {
 			case 'H':
 				halttype = "HALT";
+				down_level[0] = '0';
 				break;
 			case 'P':
 				halttype = "POWEROFF";
+				down_level[0] = '0';
 				break;
 			case 'a': /* Access control. */
 				useacl = 1;
@@ -574,6 +574,8 @@
   				break;
   			case 'h': /* Halt after shutdown */
 				down_level[0] = '0';
+				if (!halttype)
+					halttype = "POWEROFF";
   				break;
   			case 'f': /* Don't perform fsck after next boot */
   				fastboot = 1;
@@ -613,12 +615,6 @@
   		}
 	}
 
-	if (NULL != halttype && down_level[0] != '0') {
-		fprintf(stderr, "shutdown: -H and -P flags can only be used along with -h flag.\n");
-		usage();
-  		exit(1);
-	}
-
 	/* Do we need to use the shutdown.allow file ? */
 	if (useacl && (fp = fopen(SDALLOW, "r")) != NULL) {