Fix installd command line parser

Parser does not take into account that the last argument can be empty.
In this case it will skip end of line marker and continue parsing.

Change-Id: I2d029a69ed22cef497893e592ff3275ced97f85f
Signed-off-by: Serguei Katkov <serguei.i.katkov@intel.com>

cmds/installd/installd.c

@@ -243,8 +243,10 @@ static int execute(int s, char cmd[BUFFER_MAX])
                 goto done;
             }
         }
+        if (*cmd) {
           cmd++;
         }
+    }
 
     for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
         if (!strcmp(cmds[i].name,arg[0])) {