[ProfileData] Remove an unnecessary cast (NFC) (#150472)

getBufferEnd() already returns const char *.

Author: kazutakahirata

llvm/lib/ProfileData/InstrProfReader.cpp

@@ -1295,7 +1295,7 @@ Error IndexedInstrProfReader::readHeader() {
     // Writer first writes the length of compressed string, and then the actual
     // content.
     const char *VTableNamePtr = (const char *)Ptr;
-    if (VTableNamePtr > (const char *)DataBuffer->getBufferEnd())
+    if (VTableNamePtr > DataBuffer->getBufferEnd())
       return make_error<InstrProfError>(instrprof_error::truncated);
 
     VTableName = StringRef(VTableNamePtr, CompressedVTableNamesLen);