properly exit 1 when calling fx_

in a few places, we use the presence of a file found
by fx_ to cause an exit, but the command that runs
looks something like:

exit 1 "string"

this yields an error, and a non-zero exit, because of
too many arguments to "exit", but we wanted a non-zero
exit anyway.

nevertheless, this is incorrect.

to fix it, eval is used instead. if the never-going-to-exist
condition one day exists where exit 1 actually returns, not,
you know, exits, we will use err instead, with the string
as argument.

this should be fine. it's a bit hacky, but so is fx_, and
it works. fx_ is used in several places to keep the sloccount
down, providing a common way to perform while loops on the
output of a command; that is its only purpose..

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/lib.sh

@@ -75,8 +75,8 @@ chkvars()
 # e.g. coreboot is multi-tree, so 1
 singletree()
 {
-	( fx_ "exit 1" find "config/$1/"*/ -type f -name "target.cfg" ) || \
-	    return 1
+	( fx_ "eval exit 1 && err" find "config/$1/"*/ -type f \
+	    -name "target.cfg" ) || return 1; :
 }
 
 findpath()