Use C++ language supported 'nullptr' (#13944)
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		@@ -5,7 +5,7 @@
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    #undef  digitalPinToPCICR
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    #define digitalPinToPCICR(p)    ( ((p) >= 10 && (p) <= 15) || \
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                                      ((p) >= 50 && (p) <= 53) || \
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                                      ((p) >= 62 && (p) <= 69) ? &PCICR : (uint8_t *)0)
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                                      ((p) >= 62 && (p) <= 69) ? &PCICR : nullptr)
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#endif
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void setup() {
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