xbmk: simplify a few err calls

many of the messages are redundant, because errors caused
by the commands they handle would produce similar messages.

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

include/get.sh

@@ -106,8 +106,7 @@ try_file()
 	eval "[ -$echk \"$cached\" ] || return 1"
 
 	if [ "$2" = "git" ]; then
-		[ -d "$5" ] || tmpclone "$cached" "$5" "$6" "$7" || \
-		    err "Can't clone final repo in command: try_file $*"; :
+		[ -d "$5" ] || tmpclone "$cached" "$5" "$6" "$7" || err; :
 	else
 		bad_checksum "$6" "$cached" && x_ rm -f "$cached" && return 1
 		[ "$cached" != "$5" ] && x_ cp "$cached" "$5"