In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

lib/asn1_decoder.c:386:6: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
lib/asn1_decoder.c:449:6: warning: this statement may fall through 
[-Wimplicit-fallthrough=]

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enabling
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 lib/asn1_decoder.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/asn1_decoder.c b/lib/asn1_decoder.c
index dc14beae2c9a..8f3d207d2b00 100644
--- a/lib/asn1_decoder.c
+++ b/lib/asn1_decoder.c
@@ -385,6 +385,8 @@ int asn1_ber_decoder(const struct asn1_decoder *decoder,
        case ASN1_OP_END_SET_ACT:
                if (unlikely(!(flags & FLAG_MATCHED)))
                        goto tag_mismatch;
+               /* fall through */
+
        case ASN1_OP_END_SEQ:
        case ASN1_OP_END_SET_OF:
        case ASN1_OP_END_SEQ_OF:
@@ -450,6 +452,8 @@ int asn1_ber_decoder(const struct asn1_decoder *decoder,
                        pc += asn1_op_lengths[op];
                        goto next_op;
                }
+               /* fall through */
+
        case ASN1_OP_ACT:
                ret = actions[machine[pc + 1]](context, hdr, tag, data + tdp, 
len);
                if (ret < 0)
-- 
2.20.1

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