dtc: Remove gcc 4.6 "set but not used" warnings

A number of the dtc testcases trigger the new "variable set but not
used" warning from gcc 4.6.  That is they have variables which are
assigned, but then never read after that point.

In a couple of cases this is just because the variables aren't needed,
so this patch removes them.  In subnode_offset.c, it's because one
pair of variables we clearly intended to test we don't actually test.
This patch also adds this missing check.

This patch makes the testsuite compile clean with gcc 4.6.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/notfound.c

@@ -37,27 +37,25 @@ static void check_error(const char *s, int err)
 
 int main(int argc, char *argv[])
 {
-	const struct fdt_property *prop;
 	void *fdt;
 	int offset;
 	int subnode1_offset;
-	const void *val;
 	int lenerr;
 
 	test_init(argc, argv);
 	fdt = load_blob_arg(argc, argv);
 
-	prop = fdt_get_property(fdt, 0, "nonexistant-property", &lenerr);
+	fdt_get_property(fdt, 0, "nonexistant-property", &lenerr);
 	check_error("fdt_get_property(\"nonexistant-property\")", lenerr);
 
-	val = fdt_getprop(fdt, 0, "nonexistant-property", &lenerr);
+	fdt_getprop(fdt, 0, "nonexistant-property", &lenerr);
 	check_error("fdt_getprop(\"nonexistant-property\"", lenerr);
 
 	subnode1_offset = fdt_subnode_offset(fdt, 0, "subnode@1");
 	if (subnode1_offset < 0)
 		FAIL("Couldn't find subnode1: %s", fdt_strerror(subnode1_offset));
 
-	val = fdt_getprop(fdt, subnode1_offset, "prop-str", &lenerr);
+	fdt_getprop(fdt, subnode1_offset, "prop-str", &lenerr);
 	check_error("fdt_getprop(\"prop-str\")", lenerr);
 
 	offset = fdt_subnode_offset(fdt, 0, "nonexistant-subnode");

tests/path_offset.c

@@ -104,5 +104,9 @@ int main(int argc, char *argv[])
 		FAIL("Mismatch between subnode_offset (%d) and path_offset (%d)",
 		     subsubnode2_offset, subsubnode2_offset_p);
 
+	if (subsubnode2_offset2 != subsubnode2_offset2_p)
+		FAIL("Mismatch between subnode_offset (%d) and path_offset (%d)",
+		     subsubnode2_offset2, subsubnode2_offset2_p);
+
 	PASS();
 }

tests/subnode_offset.c

@@ -60,7 +60,7 @@ int main(int argc, char *argv[])
 	void *fdt;
 	int subnode1_offset, subnode2_offset;
 	int subsubnode1_offset, subsubnode2_offset, subsubnode2_offset2;
-	int ss11_off, ss12_off, ss21_off, ss22_off;
+	int ss12_off, ss21_off;
 
 	test_init(argc, argv);
 	fdt = load_blob_arg(argc, argv);
@@ -85,7 +85,7 @@ int main(int argc, char *argv[])
 	if (subsubnode2_offset != subsubnode2_offset2)
 		FAIL("Different offsets with and without unit address");
 
-	ss11_off = check_subnode(fdt, subnode1_offset, "ss1");
+	check_subnode(fdt, subnode1_offset, "ss1");
 	ss21_off = fdt_subnode_offset(fdt, subnode2_offset, "ss1");
 	if (ss21_off != -FDT_ERR_NOTFOUND)
 		FAIL("Incorrectly found ss1 in subnode2");
@@ -93,7 +93,7 @@ int main(int argc, char *argv[])
 	ss12_off = fdt_subnode_offset(fdt, subnode1_offset, "ss2");
 	if (ss12_off != -FDT_ERR_NOTFOUND)
 		FAIL("Incorrectly found ss2 in subnode1");
-	ss22_off = check_subnode(fdt, subnode2_offset, "ss2");
+	check_subnode(fdt, subnode2_offset, "ss2");
 
 	PASS();
 }