Fix inexact argument type warning

Assign the corresponding VpnProfileState for the null argument.

The varargs parameter has type "VpnProfileState...".  It needs
to decide whether the implementation want the argument to be
treated as a single-element of type VpnProfileState or no
arguement. Otherwise, it will confuse the compiler and cause
warning.

Test: atest VpnTest
Change-Id: Ic1dee696bb50cd78849de4812fb46fd764b23c6e
1 file changed