[PATCH] kbuild: fixdep: Check fstat(2) return value

[Tom Rini <trini@konsulko.com>]

Coverity has recently added a check that will find when we don't check
the return code from fstat(2).  Copy/paste the checking logic that
print_deps() has with an appropriate re-wording of the perror() message.

Cc: Michal Marek <mmarek@suse.com>
Cc: linux-kbuild@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tom Rini <trini@konsulko.com>

---
Note that I don't have a CID here was I found this in U-Boot and the
kernel hasn't yet done a build with this test being enabled.
---
 scripts/basic/fixdep.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index c68fd61..e3d9678 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -274,7 +274,11 @@ static void do_config_file(const char *filename)
 		perror(filename);
 		exit(2);
 	}
-	fstat(fd, &st);
+	if (fstat(fd, &st) < 0) {
+		fprintf(stderr, "fixdep: error fstat'ing config file: ");
+		perror(filename);
+		exit(2);
+	}
 	if (st.st_size == 0) {
 		close(fd);
 		return;
-- 
1.7.9.5