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mkmontage.rc: run mkmontage func as subproc and do "exit 1" on failure

--- a/mkmontage.rc

+++ b/mkmontage.rc

@@ -3,7 +3,8 @@

 fn mkmontage{

 	imgs=`{find -name '*.small.JPG' >[2]/dev/null | shuffle >[2]/dev/null | sed $2^q}

 	if(! ~ $#imgs $2){

-		status='not enough images'

+		echo 'E: mkmontage: not enough images' >[1=2]

+		exit 1

 	}

 	if not{

 		n=`{echo 320/$1 | bc}

@@ -11,11 +12,11 @@

 	}

 }

-if(! mkmontage 5 25

-&& ! mkmontage 4 16

-&& ! mkmontage 3 9

-&& ! mkmontage 2 4

-&& ! mkmontage 1 1){

+if(! @{mkmontage 5 25}

+&& ! @{mkmontage 4 16}

+&& ! @{mkmontage 3 9}

+&& ! @{mkmontage 2 4}

+&& ! @{mkmontage 1 1}){

 	echo 'E: failed to make montage for' `{pwd} >[1=2]

 	exit 1

 }