Standard Libraries: vsnprintf_ss: fix assert check on uninitialized v…

…ariable.

Variable n is not yet initialized when the _DIAGASSERT() check is performed
on it, which means any old garbage in n may or may not cause the assert
to occur.  I believe this is a cut-n-paste error from vsnprintf() where
n is used as a paramater, where as vsnprintf_ss() does not.

Fix this by not asserting on n.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Colin Ian King <[email protected]>

StdLib/LibC/Stdio/vsnprintf_ss.c

@@ -142,7 +142,7 @@ vsnprintf_ss(char *sbuf, size_t slen, const char *fmt0, va_list ap)
   static const char xdigs_upper[16] = "0123456789ABCDEF";
 
 
-  _DIAGASSERT(n == 0 || sbuf != NULL);
+  _DIAGASSERT(sbuf != NULL);
   _DIAGASSERT(fmt != NULL);
 
   tailp = sbuf + slen;