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kernel: use tk2ms() instead of TK2MS macro for process time conversion

this code isnt time critical and process TReal delta can become
very long, so use tk2ms() which is less prone to overflow.

--- a/sys/src/9/port/devcons.c

+++ b/sys/src/9/port/devcons.c

@@ -509,8 +509,7 @@

 			l = up->time[i];

 			if(i == TReal)

 				l = MACHP(0)->ticks - l;

-			l = TK2MS(l);

-			readnum(0, tmp+NUMSIZE*i, NUMSIZE, l, NUMSIZE);

+			readnum(0, tmp+NUMSIZE*i, NUMSIZE, tk2ms(l), NUMSIZE);

 		}

 		memmove(buf, tmp+k, n);

 		return n;

--- a/sys/src/9/port/devproc.c

+++ b/sys/src/9/port/devproc.c

@@ -905,8 +905,7 @@

 			l = p->time[i];

 			if(i == TReal)

 				l = MACHP(0)->ticks - l;

-			l = TK2MS(l);

-			readnum(0, statbuf+j+NUMSIZE*i, NUMSIZE, l, NUMSIZE);

+			readnum(0, statbuf+j+NUMSIZE*i, NUMSIZE, tk2ms(l), NUMSIZE);

 		}

 		readnum(0, statbuf+j+NUMSIZE*6, NUMSIZE, procpagecount(p)*BY2PG/1024, NUMSIZE);

-- 

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