[utest][bitmap] Typo fix.

TEST: No behavior change
Change-Id: Ie9fb329ef6131f4fc799345540cae322dd4e1c33
diff --git a/system/utest/bitmap/raw-bitmap-tests.cpp b/system/utest/bitmap/raw-bitmap-tests.cpp
index 9458ace..90abf9f 100644
--- a/system/utest/bitmap/raw-bitmap-tests.cpp
+++ b/system/utest/bitmap/raw-bitmap-tests.cpp
@@ -475,7 +475,7 @@
     EXPECT_EQ(bitmap.SetOne(16 * PAGE_SIZE - 1), ZX_OK);
     EXPECT_TRUE(bitmap.GetOne(16 * PAGE_SIZE - 1));
 
-    // But our orignal 'set bit' is still set
+    // But our original 'set bit' is still set
     EXPECT_TRUE(bitmap.GetOne(100), "Growing should not unset bits");
 
     // If we shrink and re-expand the bitmap, it should