Fix typos in various documentation and source files

The typos have been discovered with the "codespell" utility.

Signed-off-by: Thomas Huth <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: David Gibson <[email protected]>
diff --git a/tests/testutils.c b/tests/testutils.c
index a250d5a..24bd81e 100644
--- a/tests/testutils.c
+++ b/tests/testutils.c
@@ -112,7 +112,7 @@
 	prop = fdt_get_property(fdt, nodeoffset, name, &retlen);
 	verbose_printf("pointer %p\n", prop);
 	if (! prop)
-		FAIL("Error retreiving \"%s\" pointer: %s", name,
+		FAIL("Error retrieving \"%s\" pointer: %s", name,
 		     fdt_strerror(retlen));
 
 	tag = fdt32_to_cpu(prop->tag);