Make SIZE a mandatory parameter.

Commit b4eca4b24af9c80ebb2a7fa2ba539a48096b7576 introduced a new
optional parameter FILE_CONTEXTS.
But the script can accept only 1 optional parameter as the last one.
Otherwise FILE_CONTEXTS may be taken as SIZE.

Change-Id: I1a701e191769f3936cfe6557ea3a20e1691dc859
1 file changed