Fix usage lines

insmod.c

@@ -11,7 +11,7 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s filename [args]\n", argv0);
+	eprintf("usage: %s module [args]\n", argv0);
 }
 
 int

mkswap.c

@@ -24,7 +24,7 @@ struct swap_hdr {
 static void
 usage(void)
 {
-	eprintf("usage: %s swapfile\n", argv0);
+	eprintf("usage: %s device\n", argv0);
 }
 
 int

mount.c

@@ -29,7 +29,7 @@ struct {
 static void
 usage(void)
 {
-	eprintf("usage: %s [-BMRd] [-t fstype] [-o options] device dir\n",
+	eprintf("usage: %s [-BMRd] [-t fstype] [-o options] source target\n",
 		argv0);
 }
 

rmmod.c

@@ -10,7 +10,7 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s [-fw] modulename...\n", argv0);
+	eprintf("usage: %s [-fw] module...\n", argv0);
 }
 
 int

stat.c

@@ -13,7 +13,7 @@ static void show_stat(const char *file, struct stat *st);
 static void
 usage(void)
 {
-	eprintf("usage: %s [-L] filename...\n", argv0);
+	eprintf("usage: %s [-L] file...\n", argv0);
 }
 
 int

swapoff.c

@@ -8,7 +8,7 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s swapfile\n", argv0);
+	eprintf("usage: %s device\n", argv0);
 }
 
 int

swapon.c

@@ -8,7 +8,7 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s [-d] swapfile\n", argv0);
+	eprintf("usage: %s [-d] device\n", argv0);
 }
 
 int