docs: Prohibit blank lines between code/docs and EOF in coding standard.

Signed-off-by: Philip Tricca <philip.b.tricca@intel.com>
diff --git a/doc/coding_standard_c.md b/doc/coding_standard_c.md
index 1710145..23852b0 100644
--- a/doc/coding_standard_c.md
+++ b/doc/coding_standard_c.md
@@ -54,7 +54,8 @@
 ## Whitespace
 All indentation must be spaces, not tabs. Lines are indented in multiples of
 4 spaces. Each line of code and documentation will end with a non-whitespace
-character.
+character. There must *not* be any whitespace between the last line of code
+or documentation in a file and the end of the file.
 
 ## Naming Variables, Functions and Other Stuff
 Names should clearly convey the purpose of whatever is being named. While the