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devvmx: remove unncessary locking in gotcmd() sleep test function

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

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

@@ -1522,14 +1522,8 @@

 static int

 gotcmd(void *vmxp)

 {

-	int rc;

-	Vmx *vmx;

-

-	vmx = vmxp;

-	ilock(&vmx->cmdlock);

-	rc = vmx->firstcmd != nil;

-	iunlock(&vmx->cmdlock);

-	return rc;

+	Vmx *vmx = vmxp;

+	return vmx->firstcmd != nil;

 }

 static void