Missing break statement after transformCallStmt in transformStmt

HI,
Commit 76b6aa41f41db66004b1c430f17a546d4102fbe7 a new case for
CallStmt in transformStmt but forgot to add a break statement at the
end of the case. This doesn't create any problems since the default
case to which it continues without break doesn't change the result.
But this is going to cause problems in future when somebody adds a
case after CallStmt.

Here's patch with fix.
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Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company