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/hist.c

@@ -23,7 +23,7 @@ int
 main(int argc, char *argv[])
 {
 	int i;
-	
+
 	sys = sysname();
 	if(strncmp(sys, "amsterdam", 9) == 0)	/* BUG */
 		sys = "am";