"Potential usage of an uninitialized variable" build failure(s)
clang 13.0.0
int f(int b) {
  int n;
  if (b)
    n = 1;
  return n;
}
In some cases, 
n can be uninitialized.
gcc -Werror plop.c will accept this code while 
clang -Werror plop.c will fail.
| Package | Version | Supposed error message | Full log | Bug report | 
|---|
| cryptsetup | 2:2.4.1-1 | debian/scripts/suspend/cryptsetup-suspend.c:65:9: error: variable 'd_size' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] | Log |  | 
             
| monkeysphere | 0.43-3.1 | src/agent-transfer/main.c:409:14: error: variable 'mpilen' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] | Log |  | 
             
2 errors