Standardize command usage messages with cmd_usage()

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/common/cmd_mp.c b/common/cmd_mp.c
index f3a7f49..d8e3ab2 100644
--- a/common/cmd_mp.c
+++ b/common/cmd_mp.c
@@ -29,7 +29,7 @@
 	unsigned long cpuid;
 
 	if (argc < 3) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}
 
@@ -47,7 +47,7 @@
 		} else if (strncmp(argv[2], "status", 6) == 0) {
 			cpu_status(cpuid);
 		} else {
-			printf ("Usage:\n%s\n", cmdtp->usage);
+			cmd_usage(cmdtp);
 			return 1;
 		}
 		return 0;
@@ -55,12 +55,12 @@
 
 	/* 4 or greater, make sure its release */
 	if (strncmp(argv[2], "release", 7) != 0) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}
 
 	if (cpu_release(cpuid, argc - 3, argv + 3)) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}