Fix all the code which has duplicate variable declarations

core/fxcodec/codec/fx_codec_fax.cpp

Index: core/fxcodec/codec/fx_codec_fax.cpp
diff --git a/core/fxcodec/codec/fx_codec_fax.cpp b/core/fxcodec/codec/fx_codec_fax.cpp
index 97b7ee2ad6e545869b4ae5494a21fd2350402424..59010391c56930d5438b6030d138e18265cf373a 100644
--- a/core/fxcodec/codec/fx_codec_fax.cpp
+++ b/core/fxcodec/codec/fx_codec_fax.cpp
@@ -359,16 +359,16 @@ FX_BOOL FaxG4GetRow(const uint8_t* src_buf,
           if (bitpos >= bitsize) {
             return FALSE;
           }
-          FX_BOOL bit1 = NEXTBIT;
+          FX_BOOL next_bit1 = NEXTBIT;
           if (bitpos >= bitsize) {
             return FALSE;
           }
-          FX_BOOL bit2 = NEXTBIT;
-          if (bit1 && bit2) {
+          FX_BOOL next_bit2 = NEXTBIT;
+          if (next_bit1 && next_bit2) {
             v_delta = 2;
-          } else if (bit1) {
+          } else if (next_bit1) {
             v_delta = -2;
-          } else if (bit2) {
+          } else if (next_bit2) {
             if (bitpos >= bitsize) {
               return FALSE;
             }