Apply suggestions from code review

Co-authored-by: Geoffrey White <[email protected]>

Author: jketema

cpp/ql/lib/semmle/code/cpp/models/implementations/Strcat.qll

@@ -104,7 +104,7 @@ class StrlcatFunction extends TaintFunction, ArrayFunction, SideEffectFunction {
   /**
    * Gets the index of the parameter that is the size of the copy (in characters).
    */
-  int getParamSize() { exists(this.getParameter(2)) and result = 2 }
+  int getParamSize() { result = 2 }
 
   /**
    * Gets the index of the parameter that is the source of the copy.

cpp/ql/lib/semmle/code/cpp/models/implementations/Strcpy.qll

@@ -32,7 +32,7 @@ class StrcpyFunction extends ArrayFunction, DataFlowFunction, TaintFunction, Sid
         "wcsxfrm_l", // _strxfrm_l(dest, src, max_amount, locale)
         "_mbsnbcpy", // _mbsnbcpy(dest, src, max_amount)
         "stpcpy", // stpcpy(dest, src)
-        "stpncpy", // stpcpy(dest, src, max_amount)
+        "stpncpy", // stpncpy(dest, src, max_amount)
         "strlcpy" // strlcpy(dst, src, dst_size)
       ])
     or