Commita3e8486

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Prevent possible compiler warnings.

Simon Riggs reports that rnode.dbNode and rnode.spcNode weregenerating unused variable warnings on gcc 4.4.3 with CFLAGS=-O1

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Original file line number	Diff line number	Diff line change
`@@ -603,6 +603,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)`
`603`	`603`	`default:`
`604`	`604`	`/* no storage, return NULL */`
`605`	`605`	`rnode.relNode=InvalidOid;`
	`606`	`+/* some compilers generate warnings without these next two lines */`
	`607`	`+rnode.dbNode=InvalidOid;`
	`608`	`+rnode.spcNode=InvalidOid;`
`606`	`609`	`break;`
`607`	`610`	`}`
`608`	`611`

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