CI: allow meaningful error messages

- Move set -e down in the script so that the error-handling
   at the top (which prints meaningful error messages) isn't
   short-circuited by the -e.

ci/calamaresstyle

@@ -6,8 +6,6 @@
 # You can pass in directory names, in which case the files
 # in that directory (NOT below it) are processed.
 #
-set -e
-
 AS=$( which astyle )
 
 for _cf in clang-format-7 clang-format-8 clang-format70 clang-format80
@@ -22,6 +20,8 @@ test -n "$CF" || { echo "! No clang-format-7 found in PATH"; exit 1 ; }
 test -x "$AS" || { echo "! $AS is not executable."; exit 1 ; }
 test -x "$CF" || { echo "! $CF is not executable."; exit 1 ; }
 
+set -e
+
 any_dirs=no
 for d in "$@"
 do