[PATCH] udev - safer sprintf() use

[PATCH] udev - safer sprintf() use

Here is for now my last patch to the string handling for a rather
theorethical case, where the node is very very very long. :)

We have accordant to strfieldcat(to, from) now a strintcat(to, i) macro,
which appends the ascii representation of a integer to a string in a
safe way.