tap: Avoid bogus missingReturn cppcheck warning in tap_l2_max_len()

Cppcheck 2.14.2 on Alpine Linux (musl) says that:

tap.c:111:19: error: Found an exit path from function with non-void return type that has missing return statement [missingReturn]
 switch (c->mode) {
                  ^

This exit path is not reachable because we ASSERT(0) after the switch,
but for some reason cppcheck doesn't see this with musl headers. Hide
the warning with a redundant return statement.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/tap.c b/tap.c
index d630f6d..6db5d88 100644
--- a/tap.c
+++ b/tap.c
@@ -118,6 +118,8 @@ unsigned long tap_l2_max_len(const struct ctx *c)
 	}
 	/* NOLINTEND(bugprone-branch-clone) */
 	ASSERT(0);
+
+	return 0; /* Unreachable, for cppcheck's sake */
 }
 
 /**