Clean up trailing whitespace in the kernel headers.

And fix the scripts so they stop letting trailing whitespace through.

Change-Id: Ie109fbe1f63321e565ba0fa60fee8e9cf3a61cfc
diff --git a/libc/kernel/common/linux/irq_cpustat.h b/libc/kernel/common/linux/irq_cpustat.h
index 2a568cc..f2683d5 100644
--- a/libc/kernel/common/linux/irq_cpustat.h
+++ b/libc/kernel/common/linux/irq_cpustat.h
@@ -23,6 +23,6 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #define local_softirq_pending()   __IRQ_STAT(smp_processor_id(), __softirq_pending)
-#define nmi_count(cpu) __IRQ_STAT((cpu), __nmi_count)  
+#define nmi_count(cpu) __IRQ_STAT((cpu), __nmi_count)
 #endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */