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

"Potential usage of an uninitialized variable" build failure(s) — clang 11.0.0

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
glewlwyd	2.4.0-1	register.c:1270:14: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]	Log
monkeysphere	0.43-3	src/agent-transfer/main.c:409:14: error: variable 'mpilen' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]	Log
vzquota	3.1-4	quotaon.c:1002:7: error: variable 'ugid' is used uninitialized whenever '\|\|' condition is true [-Werror,-Wsometimes-uninitialized]	Log	753065

3 errors