Potential usage of an uninitialized variable - Rebuild of the Debian archive with clang

"Potential usage of an uninitialized variable" build failure(s) — clang 12.0.1

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