Changed the help for the '--ipcprot' option.

btpd/main.c

@@ -99,9 +99,9 @@ usage(void)
         "--help\n"
         "\tShow this text.\n"
         "\n"
-        "--ipcprot prot\n"
-        "\tChange the protection mode on the command socket to prot.\n"
-        "\tThe mode must be specified in octal. Default is 0600.\n"
+        "--ipcprot mode\n"
+        "\tSet the protection mode of the command socket.\n"
+        "\tThe mode is specified by an octal number. Default is 0600.\n"
         "\n"
         "--logfile file\n"
         "\tWhere to put the logfile. By default it's put in the btpd dir.\n"