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Use correctly-sized buffer when zero-filling a WAL file.

I mixed up BLCKSZ and XLOG_BLCKSZ when I changed the way the buffer isallocated a couple of weeks ago. With the default settings, they are both8k, but they can be changed at compile-time.

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src/backend/access/transam
- xlog.c

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`‎src/backend/access/transam/xlog.c‎`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -2449,7 +2449,7 @@ XLogFileInit(uint32 log, uint32 seg,`
`2449`	`2449`	`{`
`2450`	`2450`	`charpath[MAXPGPATH];`
`2451`	`2451`	`chartmppath[MAXPGPATH];`
`2452`		`-charzbuffer_raw[BLCKSZ+MAXIMUM_ALIGNOF];`
	`2452`	`+charzbuffer_raw[XLOG_BLCKSZ+MAXIMUM_ALIGNOF];`
`2453`	`2453`	`char*zbuffer;`
`2454`	`2454`	`uint32installed_log;`
`2455`	`2455`	`uint32installed_seg;`
`@@ -2511,7 +2511,7 @@ XLogFileInit(uint32 log, uint32 seg,`
`2511`	`2511`	`* cycles transferring data to the kernel.`
`2512`	`2512`	`*/`
`2513`	`2513`	`zbuffer= (char*)MAXALIGN(zbuffer_raw);`
`2514`		`-memset(zbuffer,0,BLCKSZ);`
	`2514`	`+memset(zbuffer,0,XLOG_BLCKSZ);`
`2515`	`2515`	`for (nbytes=0;nbytes<XLogSegSize;nbytes+=XLOG_BLCKSZ)`
`2516`	`2516`	`{`
`2517`	`2517`	`errno=0;`

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Commita4c4e0b

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`‎src/backend/access/transam/xlog.c‎`

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