Beautify UpdateCatalogForStandbyPromotion and suppress coverity report.
#1501
+2
−2
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Some variable declaration to beginning of function to enforce C90 and long-standing coding practice of PostgreSQL. Also, be tidy, and release memory allocated in GetDatabasePath. This is not a real memory leak, as standby promotion happends only once (until next restart).
Per coverity report 529246.