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nusb/cam: remove wrong func prototypes, print probe control

--- a/sys/src/cmd/nusb/cam/cam.c

+++ b/sys/src/cmd/nusb/cam/cam.c

@@ -12,22 +12,6 @@

 char user[] = "cam";

-void printVCHeader(void *vp);

-void printVCInputTerminal(void *vp);

-void printVCOutputTerminal(void *vp);

-void printVCCameraTerminal(void *vp);

-void printVCSelectorUnit(void *vp);

-void printVCProcessingUnit(void *vp);

-void printVCEncodingUnit(void *vp);

-void printVCExtensionUnit(void *vp);

-void printVSInputHeader(void *vp);

-void printVSOutputHeader(void *vp);

-void printVSStillFrame(void *vp);

-void printVSUncompressedFormat(void *vp);

-void printVSUncompressedFrame(void *vp);

-void printVSColorFormat(void *vp);

-void printProbeControl(void *vp);

-

 Cam *cams;

 int nunit;

 VCUnit **unit;

@@ -188,6 +172,7 @@

 		if(Class(d->iface->csp) != CC_VIDEO) continue;

 		printDescriptor(&fmt, d->iface, vdp);

 	}

+	printProbeControl(&fmt, &c->pc);

 	return fmtstrflush(&fmt);

 }

--- a/sys/src/cmd/nusb/cam/fns.h

+++ b/sys/src/cmd/nusb/cam/fns.h

@@ -1,4 +1,5 @@

 char *ctlread(Cam *);

+void printProbeControl(Fmt *fmt, void *vp);

 void printDescriptor(Fmt *, Iface *, void *);

 int videoopen(Cam *, int);

 void videoclose(Cam *);