[clang] Fixed issue #128882: don't warn if 1st argument to 'getcwd' is NULL (PR #135720)

[Balazs Benics via cfe-commits]

================
@@ -105,9 +105,6 @@ void errno_getcwd(char *Buf, size_t Sz) {
     clang_analyzer_eval(errno != 0);   // expected-warning{{TRUE}}
     clang_analyzer_eval(Path == NULL); // expected-warning{{TRUE}}
     if (errno) {}                      // no warning
-  } else if (Path == NULL) {
-    clang_analyzer_eval(errno != 0);   // expected-warning{{TRUE}}
-    if (errno) {}                      // no warning
----------------
steakhal wrote:

Oh, indeed it was there:
```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
c:\ws\src\build\bin\clang.exe -cc1 -internal-isystem C:\ws\src\build\lib\clang\21\include -nostdsysteminc -analyze -analyzer-constraints=range -setup-static-analyzer -verify C:\ws\src\clang\test\Analysis\errno-stdlibraryfunctions.c    -analyzer-checker=core    -analyzer-checker=debug.ExprInspection    -analyzer-checker=unix.StdCLibraryFunctions    -analyzer-checker=apiModeling.Errno    -analyzer-checker=unix.Errno    -analyzer-config unix.StdCLibraryFunctions:ModelPOSIX=true
# executed command: 'c:\ws\src\build\bin\clang.exe' -cc1 -internal-isystem 'C:\ws\src\build\lib\clang\21\include' -nostdsysteminc -analyze -analyzer-constraints=range -setup-static-analyzer -verify 'C:\ws\src\clang\test\Analysis\errno-stdlibraryfunctions.c' -analyzer-checker=core -analyzer-checker=debug.ExprInspection -analyzer-checker=unix.StdCLibraryFunctions -analyzer-checker=apiModeling.Errno -analyzer-checker=unix.Errno -analyzer-config unix.StdCLibraryFunctions:ModelPOSIX=true
# .---command stderr------------
# | error: 'expected-warning' diagnostics seen but not expected: 
# |   File C:\ws\src\clang\test\Analysis\errno-stdlibraryfunctions.c Line 109: FALSE [debug.ExprInspection]
# | 1 error generated.
# `-----------------------------
# error: command failed with exit status: 1

--
```

https://github.com/llvm/llvm-project/pull/135720