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/usage.c

@@ -9,7 +9,7 @@ main(int argc, char **argv)
 	char *argv0, *args, *flags, *p, *p0;
 	int single;
 	Rune r;
-	
+
 	argv0 = getenv("0");
 	if(argv0 == nil) {
 		if(argc > 1)
@@ -21,7 +21,7 @@ main(int argc, char **argv)
 		argv0 = p+1;
 	flags = getenv("flagfmt");
 	args = getenv("args");
-	
+
 	if(argv0 == nil){
 		fprint(2, "aux/usage: $0 not set\n");
 		exits("$0");