tracetool: Forbid argument name 'next'

It has happened more than once that patches that look perfectly sane
and work with simpletrace broke systemtap because they use 'next' as an
argument name for a tracing function. However, 'next' is a keyword for
systemtap, so we shouldn't use it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

scripts/tracetool

@@ -81,6 +81,10 @@ get_args()
     args=${1#*\(}
     args=${args%%\)*}
     echo "$args"
+
+    if (echo "$args" | grep "[ *]next\($\|[, ]\)" > /dev/null 2>&1); then
+        echo -e "\n#error 'next' is a bad argument name (clash with systemtap keyword)\n "
+    fi
 }
 
 # Get the argument name list of a trace event