[PATCH 6/6] mdmon: refactor md device name check in main()

[Mateusz Kusiak <mateusz.kusiak@intel.com>]

Refactor mdmon main function to verify if fd is valid prior to checking
device name. This is due to static code analysis complaining after
change b938519e7719 ("util: remove obsolete code from get_md_name").

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
---
 mdmon.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/mdmon.c b/mdmon.c
index a2038fe6c35f..5fdb5cdb5a49 100644
--- a/mdmon.c
+++ b/mdmon.c
@@ -302,12 +302,12 @@ static int mdmon(char *devnm, int must_fork, int takeover);
 int main(int argc, char *argv[])
 {
 	char *container_name = NULL;
-	char *devnm = NULL;
 	int status = 0;
 	int opt;
 	int all = 0;
 	int takeover = 0;
 	int dofork = 1;
+	int mdfd = -1;
 	bool help = false;
 	static struct option options[] = {
 		{"all", 0, NULL, 'a'},
@@ -410,19 +410,20 @@ int main(int argc, char *argv[])
 		free_mdstat(mdstat);
 
 		return status;
-	} else {
-		int mdfd = open_mddev(container_name, 0);
-		devnm = fd2devnm(mdfd);
+	}
+
+	mdfd = open_mddev(container_name, 0);
+	if (is_fd_valid(mdfd)) {
+		char *devnm = fd2devnm(mdfd);
 
 		close(mdfd);
-	}
 
-	if (!devnm) {
-		pr_err("%s is not a valid md device name\n",
-			container_name);
-		return 1;
+		if (devnm)
+			return mdmon(devnm, dofork && do_fork(), takeover);
 	}
-	return mdmon(devnm, dofork && do_fork(), takeover);
+
+	pr_err("%s is not a valid md device name\n", container_name);
+	return 1;
 }
 
 static int mdmon(char *devnm, int must_fork, int takeover)
-- 
2.35.3