[patch] return a non-zero exit status when the BLKTRACETEARDOWN ioctl fails

[Jeff Moyer <jmoyer@xxxxxxxxxx>]

Hi,

I'm doing some scripting, and would really like to know when things
fail.  ;)

Signed-off-by: Jeff Moyer <jmoyer@xxxxxxxxxx>

diff --git a/blktrace.c b/blktrace.c
index b4c919d..23f3eb5 100644
--- a/blktrace.c
+++ b/blktrace.c
@@ -2634,6 +2634,7 @@ int main(int argc, char *argv[])
 				fprintf(stderr,
 					"BLKTRACETEARDOWN %s failed: %d/%s\n",
 					dpp->path, errno, strerror(errno));
+				ret = 1;
 			}
 		}
 	} else if (net_mode == Net_server) {
--
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