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boorc, nusbrc: fix wrong redirections after &

the rc & operator changes stdin to /dev/null, so we
have to do the <[0=1] inside the {}

this never showed up as an issue because many
fileservers just read 9p messages from standard
output.

--- a/sys/src/9/boot/local.rc

+++ b/sys/src/9/boot/local.rc

@@ -45,7 +45,7 @@

 }

 fn bootfs{

-	{$1 -s -f $*(2-) &} <[0=1] | echo 0 >/srv/boot

+	{$1 -s -f $*(2-) <[0=1] &} | echo 0 >/srv/boot

 }

 fn connectlocal{

--- a/sys/src/9/boot/nusbrc

+++ b/sys/src/9/boot/nusbrc

@@ -45,7 +45,7 @@

 						diskparts $dev

 						for(part in $dev/dos* $dev/9fat* $dev/data) if(test -r $part && ~ `{fstype $part} dos) {

 							mkdir -m 0700 '#σc/'^$dev || exit

-							{dossrv -s -f $part &} <[0=1] |

+							{dossrv -s -f $part <[0=1] &} |

 								echo 0 >'#σc/'^$dev/dos

 							exit

 						}