[pinmap] Remove useless comment

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/stm32/pinmap.c

@@ -56,7 +56,6 @@ void *pinmap_peripheral(PinName pin, const PinMap *map)
  if (pin != (PinName)NC) {
  peripheral = pinmap_find_peripheral(pin, map);
  }
- // else error("pinmap not found for peripheral");
  return peripheral;
 }
 
@@ -78,7 +77,6 @@ PinName pinmap_pin(void *peripheral, const PinMap *map)
  if (peripheral != NP) {
  pin = pinmap_find_pin(peripheral, map);
  }
- // else error("pinmap not found for pin");
  return pin;
 }
 
@@ -100,7 +98,6 @@ uint32_t pinmap_function(PinName pin, const PinMap *map)
  if (pin != (PinName)NC) {
  function = pinmap_find_function(pin, map);
  }
- // else error("pinmap not found for function");
  return function;
 }
 
@@ -134,7 +131,6 @@ void *pinmap_merge_peripheral(void *a, void *b)
  }
 
  // mis-match error case
- // error("pinmap mis-match");
  return NP;
 }