[PATCH nft] mnl: continue monitor if errno is ESRCH

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Running the test cases in the shell directory while running nft monitor results
in nft exiting with '# ERROR: No such process'. The minimal steps where I could
reproduce is:

nft monitor # shell 1
run-tests.sh testcases/sets/0011add_many_elements_0 # shell 2

Signed-off-by: Alexander Alemayhu <alexander@xxxxxxxxxxxx>
---

Not sure if this is considered a fix or desired behaviour, but I was not
expecting monitor to exit like this.

 src/mnl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mnl.c b/src/mnl.c
index 295dd84a5840..a0066a28b44f 100644
--- a/src/mnl.c
+++ b/src/mnl.c
@@ -1129,7 +1129,10 @@ int mnl_nft_event_listener(struct mnl_socket *nf_sock,
 				printf("# ERROR: We lost some netlink events!\n");
 				continue;
 			}
+
 			fprintf(stdout, "# ERROR: %s\n", strerror(errno));
+			if (errno == ESRCH)
+				continue;
 			break;
 		}
 		ret = mnl_cb_run(buf, ret, 0, 0, cb, cb_data);
-- 
2.9.3

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