Fix bad return value checks (detected with Coccinelle)

In the "Getting Started with Coccinelle - KVM edition" presentation that
has been held by Julia Lawall at the KVM forum 2015 (see the slides at
http://events.linuxfoundation.org/sites/events/files/slides/tutorial_kvm_0.pdf),
she pointed out some bad return value checks in U-Boot that can be
detected with Coccinelle by using the following config file:

@@
identifier x,y;
identifier f;
statement S;
@@
x = f(...);
(
 if (x < 0) S
|
 if (
-     y
+     x
 < 0) S
)

This patch now fixes these issues.

Signed-off-by: Thomas Huth <huth@tuxfamily.org>

board/samsung/origen/tools/mkorigenspl.c

@@ -52,7 +52,7 @@ int main(int argc, char **argv)
 	}
 
 	ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
-	if (ifd < 0) {
+	if (ofd < 0) {
 		fprintf(stderr, "%s: Can't open %s: %s\n",
 			argv[0], argv[2], strerror(errno));
 		if (ifd)

board/samsung/smdkv310/tools/mksmdkv310spl.c

@@ -50,7 +50,7 @@ int main(int argc, char **argv)
 	}
 
 	ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
-	if (ifd < 0) {
+	if (ofd < 0) {
 		fprintf(stderr, "%s: Can't open %s: %s\n",
 			argv[0], argv[2], strerror(errno));
 		if (ifd)

drivers/hwmon/lm81.c

@@ -90,7 +90,7 @@ int dtt_init_one(int sensor)
 	if (adr < 0)
 		return 1;
 	rev = dtt_read (sensor, DTT_REV);
-	if (adr < 0)
+	if (rev < 0)
 		return 1;
 
 	debug ("DTT:   Found LM81@%x Rev: %d\n", adr, rev);

tools/fit_check_sign.c

@@ -75,7 +75,7 @@ int main(int argc, char **argv)
 	if (ffd < 0)
 		return EXIT_FAILURE;
 	kfd = mmap_fdt(cmdname, keyfile, 0, &key_blob, &ksbuf, false);
-	if (ffd < 0)
+	if (kfd < 0)
 		return EXIT_FAILURE;
 
 	image_set_host_blob(key_blob);

tools/mkexynosspl.c

@@ -110,7 +110,7 @@ int main(int argc, char **argv)
 	}
 
 	ofd = open(argv[of_index], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
-	if (ifd < 0) {
+	if (ofd < 0) {
 		fprintf(stderr, "%s: Can't open %s: %s\n",
 			prog_name, argv[of_index], strerror(errno));
 		exit(EXIT_FAILURE);