From e2353e7c13808e47efb844f8fb10b7aa2142e619 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Fri, 13 Mar 2015 21:10:13 -0500
Subject: [PATCH] gpt-auto-generator: allow type check to fail

add_mount() is OK with unknow file type, but we have to initalize
the variable to NULL not to pass garbage on error.

(cherry picked from commit a0b1209c4a59754f428894e0485413542da50014)
---
 src/gpt-auto-generator/gpt-auto-generator.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/gpt-auto-generator/gpt-auto-generator.c b/src/gpt-auto-generator/gpt-auto-generator.c
index cceeeb845..00a2141a5 100644
--- a/src/gpt-auto-generator/gpt-auto-generator.c
+++ b/src/gpt-auto-generator/gpt-auto-generator.c
@@ -291,7 +291,7 @@ static int probe_and_add_mount(
                 const char *post) {
 
         _cleanup_blkid_free_probe_ blkid_probe b = NULL;
-        const char *fstype;
+        const char *fstype = NULL;
         int r;
 
         assert(id);
@@ -324,14 +324,11 @@ static int probe_and_add_mount(
         r = blkid_do_safeprobe(b);
         if (r == -2 || r == 1) /* no result or uncertain */
                 return 0;
-        else if (r != 0) {
-                if (errno == 0)
-                        errno = EIO;
-                log_error_errno(errno, "Failed to probe %s: %m", what);
-                return -errno;
-        }
+        else if (r != 0)
+                return log_error_errno(errno ?: EIO, "Failed to probe %s: %m", what);
 
-        blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
+        /* add_mount is OK with fstype being NULL. */
+        (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
 
         return add_mount(
                         id,