dumpelf.c: add missing break when decoding SHT_GNU_LIBLIST

Detected by gcc-10 as:
```
dumpelf.c: In function 'dump_shdr':
dumpelf.c:462:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
  462 |    printf("\t */\n"); \
      |    ^~~~~~~~~~~~~~~~~
```

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/dumpelf.c b/dumpelf.c
index 405beba..bc634f0 100644
--- a/dumpelf.c
+++ b/dumpelf.c
@@ -460,6 +460,7 @@ static void dump_shdr(elfobj *elf, const void *shdr_void, size_t shdr_cnt, const
 					++lib; \
 				} \
 			printf("\t */\n"); \
+			break; \
 		} \
 		default: { \
 			if (be_verbose <= 1) \