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

"Potential usage of an uninitialized variable" build failure(s) — clang 3.2

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
altermime	0.3.10-7	mime_alter.c:709:13: error: variable 'newblock' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]	Log	~~753058~~
drivel	3.0.3-1	dialogs.c:880:6: error: variable 'friend' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]	Log
gcompris	12.01-1	gameutil.c:461:5: error: variable 'y2' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]	Log
geoclue	0.12.0-4	master-provider.c:176:6: error: variable 'new_hor_acc' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]	Log
libnss-cache	0.10.2-1	nss_cache.c:155:11: error: variable 'ret' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]	Log	~~745258~~
libpam-abl	0.4.3-1	pam_abl.c:162:9: error: variable 'dbenv' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]	Log
tpm-tools	1.3.7-1	tpm_present.c:189:9: error: variable 'hTpmPolicy' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]	Log	~~753063~~
tuxpuck	0.8.2-2.2	ttf2font.c:56:7: error: variable 'ysize' is used uninitialized whenever '\|\|' condition is true [-Werror,-Wsometimes-uninitialized]	Log	~~753064~~

8 errors