handover: Call the right function and avoid recursion

Fix a brown paper bag bug and call the right method. The above was
an infinite recursion. The stack didn't overflow as the compiler
optimized the tail-recursion and coverity didn't complain either.

The issue was introduced in the last minutes before the merge
when I renamed "reset_handover" to "handover_reset" to follow
the object_verb approach throughout the handover.c code. While
doing that I sadly replaced reset_handover with handover_frame
and not handover_reset.

src/common/handover.c

@@ -143,7 +143,7 @@ void handover_frame(struct gsm_lchan *lchan)
 {
 	LOGP(DHO, LOGL_INFO,
 		"%s First valid frame detected\n", gsm_lchan_name(lchan));
-	handover_frame(lchan);
+	handover_reset(lchan);
 }
 
 /* release handover state */