decl.c (check_previous_goto_1): When decl_jump_unsafe returns 2 emit an error instead of a permerror.

/cp
2018-08-15  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (check_previous_goto_1): When decl_jump_unsafe returns 2
	emit an error instead of a permerror.

/testsuite
2018-08-15  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/init/goto3.C: Adjust for error instead of permerror.

From-SVN: r263551