[lldb] Adjust the for loop condition to prevent unintended increments in ExpandRLE (NFC)

Address the issue reported by static analyser cppcheck regarding missing bounds check for extra iterator increment in a loop.
This could lead to accessing out-of-bounds memory. To fix this we have adjusted the loop conditions to not incrementing iterator c there..

Caught by cppcheck -
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp:1300:75: warning: Missing bounds check for extra iterator increment in loop. [StlMissingComparison]

Fix #91225

Author: xgupta

lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp

@@ -1297,7 +1297,7 @@ std::string GDBRemoteCommunication::ExpandRLE(std::string packet) {
   // Reserve enough byte for the most common case (no RLE used).
   std::string decoded;
   decoded.reserve(packet.size());
-  for (std::string::const_iterator c = packet.begin(); c != packet.end(); ++c) {
+  for (std::string::const_iterator c = packet.begin(); c != packet.end();) {
     if (*c == '*') {
       // '*' indicates RLE. Next character will give us the repeat count and
       // previous character is what is to be repeated.
@@ -1316,6 +1316,7 @@ std::string GDBRemoteCommunication::ExpandRLE(std::string packet) {
     } else {
       decoded.push_back(*c);
     }
+    c++;
   }
   return decoded;
 }