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pc/pc64: reset DR7 in mmurelease

--- a/sys/src/9/pc/mmu.c

+++ b/sys/src/9/pc/mmu.c

@@ -387,6 +387,8 @@

 		proc->ldt = nil;

 		proc->nldt = 0;

 	}

+	if(proc->dr[7] != 0)

+		putdr7(0);

 }

 /*

--- a/sys/src/9/pc64/mmu.c

+++ b/sys/src/9/pc64/mmu.c

@@ -425,6 +425,8 @@

 		proc->kmapcount = proc->kmapindex = 0;

 	}

 	mmufree(proc);

+	if(proc->dr[7] != 0)

+		putdr7(0);

 	taskswitch((uintptr)m+MACHSIZE);

 }