[lldb] Fix redundant condition in compression type check (NFC)

The `else if` condition for checking `m_compression_type` is redundant as it matches with a previous `if` condition, making the expression always false.
Reported by cppcheck as a possible cut-and-paste error.

Caught by cppcheck -
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp:543:35: style: Expression is always false because 'else if' condition matches previous condition at line 535. [multiCondition]

Fix llvm#91222

Author: xgupta

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

@@ -540,8 +540,6 @@ bool GDBRemoteCommunication::DecompressPacket() {
         scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_ZLIB);
       else if (m_compression_type == CompressionType::LZMA)
         scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZMA);
-      else if (m_compression_type == CompressionType::LZFSE)
-        scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZFSE);
       if (scratchbuf_size > 0) {
         m_decompression_scratch = (void*) malloc (scratchbuf_size);
         m_decompression_scratch_type = m_compression_type;