kernel: various cleanups, attempt to fix mmu
 [rsc] --rw-rw-r-- M 413509 glenda sys 21147 Mar 11 09:19 sys/src/9/port/devaudio.c
	/n/sourcesdump/2006/0311/plan9/sys/src/9/port/devaudio.c:1206,1211 - 
	/n/sourcesdump/2006/0312/plan9/sys/src/9/port/devaudio.c:1206,1212
	  				audio.filling = 0;
	  				swab(b->virt);
	  				putbuf(&audio.full, b);
	+ 				pokeaudio();
	  			}
	  		}
	  		poperror();
 [rsc] --rw-rw-r-- M 413509 glenda sys 28500 Mar 11 09:20 sys/src/9/port/devproc.c
	/n/sourcesdump/2006/0311/plan9/sys/src/9/port/devproc.c:1395,1401 - 
	/n/sourcesdump/2006/0312/plan9/sys/src/9/port/devproc.c:1395,1401
	  			p->trace ^= 1;
	  			break;
	  		case 2:
	- 			p->trace = atoi(cb->f[1])?1:0;
	+ 			p->trace = (atoi(cb->f[1]) != 0);
	  			break;
	  		default:
	  			error("args");
 [rsc] --rw-rw-r-- M 413509 glenda sys 25229 Mar 11 19:45 sys/src/9/pc/mmu.c
	[diffs elided - too long]
	[diff -c /n/sourcesdump/2006/0311/plan9/sys/src/9/pc/mmu.c /n/sourcesdump/2006/0312/plan9/sys/src/9/pc/mmu.c]