inject.sh: redirect stderer to /dev/null FIRST

for the grep command, we must ensure that errors are
suppressed *BEFORE* outputting to a file. depending
on the sh implementation, the previous code might
have begun outputting to a file before suppressing
errors.

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

include/inject.sh

@@ -112,7 +112,7 @@ readkconfig()
 scankconfig()
 {
 	for cbc in $cv; do
-		grep "$cbc" "$1" 1>>"$xbtmp/cbcfg" 2>/dev/null || :
+		grep "$cbc" "$1" 2>/dev/null 1>>"$xbtmp/cbcfg" || :
 	done
 }