Fix to CharPointer_UTF8::operator--

modules/juce_core/text/juce_CharPointer_UTF8.h

@@ -134,18 +134,10 @@ public:
     /** Moves this pointer back to the previous character in the string. */
     CharPointer_UTF8& operator--() noexcept
     {
-        const char n = *--data;
+        int count = 0;
 
-        if ((n & 0xc0) == 0xc0)
-        {
-            int count = 3;
-
-            do
-            {
-                --data;
-            }
-            while ((*data & 0xc0) == 0xc0 && --count >= 0);
-        }
+        while ((*--data & 0xc0) == 0x80 && ++count < 4)
+        {}
 
         return *this;
     }