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Check for fseeko() failure in pg_dump's _tarAddFile().

Coverity pointed out, not unreasonably, that we checked fseeko'sresult at every other call site but these. Failure to seek in thetemp file (note this is NOT pg_dump's output file) seems quiteunlikely, and even if it did happen the file length cross-checkfurther down would probably detect the problem. Still, that's apoor excuse for not checking the result of a system call.

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src/bin/pg_dump
- pg_backup_tar.c

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`‎src/bin/pg_dump/pg_backup_tar.c`

Lines changed: 4 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1085,11 +1085,13 @@ _tarAddFile(ArchiveHandle AH, TAR_MEMBER th)`
`1085`	`1085`	`/*`
`1086`	`1086`	`* Find file len & go back to start.`
`1087`	`1087`	`*/`
`1088`		`-fseeko(tmp,0,SEEK_END);`
	`1088`	`+if (fseeko(tmp,0,SEEK_END)!=0)`
	`1089`	`+fatal("error during file seek: %m");`
`1089`	`1090`	`th->fileLen=ftello(tmp);`
`1090`	`1091`	`if (th->fileLen<0)`
`1091`	`1092`	`fatal("could not determine seek position in archive file: %m");`
`1092`		`-fseeko(tmp,0,SEEK_SET);`
	`1093`	`+if (fseeko(tmp,0,SEEK_SET)!=0)`
	`1094`	`+fatal("error during file seek: %m");`
`1093`	`1095`
`1094`	`1096`	`_tarWriteHeader(th);`
`1095`	`1097`

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Commit418414d

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`‎src/bin/pg_dump/pg_backup_tar.c`

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