Update Print.cpp (#3060)

#2891

Update Print.cpp (#3060)
#2891
007a93ec · Mike Dunston · Me No Dev · a5f3fc6f · 007a93ec
Commit 007a93ec authored Aug 20, 2019 by Mike Dunston Committed by Me No Dev Aug 20, 2019
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cores/esp32/Print.cpp cores/esp32/Print.cpp +1 -1

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--- a/cores/esp32/Print.cpp
+++ b/cores/esp32/Print.cpp
@@ -52,7 +52,7 @@ size_t Print::printf(const char *format, ...)
    va_list copy;
    va_start(arg, format);
    va_copy(copy, arg);
-    size_t len = vsnprintf(NULL, 0, format, arg);
+    size_t len = vsnprintf(NULL, 0, format, copy);
    va_end(copy);
    if(len >= sizeof(loc_buf)){
        temp = new char[len+1];