[clang] [clang][analyzer] fix crash when modelling 'getline' function in checkers (PR #145229)

[Baranov Victor via cfe-commits]

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@@ -369,6 +380,9 @@ ProgramStateRef UnixAPIMisuseChecker::EnsureGetdelimBufferAndSizeCorrect(
 
 void UnixAPIMisuseChecker::CheckGetDelim(CheckerContext &C,
                                          const CallEvent &Call) const {
+  if (Call.getNumArgs() < 2)
+    return;
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vbvictor wrote:

`CheckGetDelim` process both `getline` and `getdelim` functions, so the condition must be
`!= 3 || != 4`.
As for now, I go for "if it doesn't crush, let it work", thus test case `TEST_GETLINE_2` works even with no 3rd parameter provided.
I can make this condition more strict.

https://github.com/llvm/llvm-project/pull/145229