try_parse.sh: add a verbose mode and a meaningful exit code.

scripts/coccinelle/try_parse.sh

@@ -5,6 +5,8 @@
 
 top="$(dirname "$0")/../.."
 
+exitcode=0
+
 for fn in "$@"; do
 
     if spatch -macro_file_builtins "$top"/scripts/coccinelle/tor-coccinelle.h \
@@ -13,6 +15,13 @@ for fn in "$@"; do
         : # it's perfect
     else
         echo "$fn"
+        if test "${VERBOSE}" != ""; then
+            spatch -macro_file_builtins "$top"/scripts/coccinelle/tor-coccinelle.h \
+                   -I "$top" -I "$top"/src -I "$top"/ext --parse-c "$fn"
+        fi
+        exitcode=1
     fi
 
 done
+
+exit "$exitcode"