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devfs-posix: fix pread/pwrite for large (>2Gb) files

--- a/kern/devfs-posix.c

+++ b/kern/devfs-posix.c

@@ -305,7 +305,8 @@

 static long

 fsread(Chan *c, void *va, long n, vlong offset)

 {

-	int fd, r;

+	int fd;

+	vlong r;

 	Ufsinfo *uif;

 /*print("fsread %s\n", chanpath(c));*/

@@ -340,7 +341,8 @@

 static long

 fswrite(Chan *c, void *va, long n, vlong offset)

 {

-	int fd, r;

+	int fd;

+	vlong r;

 	Ufsinfo *uif;

 	uif = c->aux;