_cpp_replacement_text_len and len

[Andrew Pinski]

These are new warnings and they look not be a false positive:
gcc/cpptrad.c: In function `_cpp_replacement_text_len':
gcc/cpptrad.c:802: warning: `len' might be used uninitialized in 
this function

It looks like len should be initialized to 0 at the begin of the 
function.

Attached is a fix
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