Trivial changes: whitespace and modes.

Remote whitespace at the ends of lines.
Remove blank lines from the ends of files.
Change modes on source files so that they
are not executable.

Signed-off-by: Dan Cross <cross@gajendra.net>

src/cmd/awk/main.c

@@ -195,4 +195,3 @@ char *cursource(void)	/* current source file name */
 	else
 		return NULL;
 }
-