Get rid of most instance of 'foo == NULL'

core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
index 5fbdcc634c1c9aa5222d5fec57effd377a5635d9..c855a7c5c2eab3611a9ff0d6dacb090a03d28c31 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
@@ -454,7 +454,7 @@ CFX_WideString PDF_DecodeText(const uint8_t* src_data,
       }
     }
     result.ReleaseBuffer(dest_pos);
-  } else if (pCharMap == NULL) {
+  } else if (!pCharMap) {
     FX_WCHAR* dest_buf = result.GetBuffer(src_len);
     for (FX_DWORD i = 0; i < src_len; i++) {
       dest_buf[i] = PDFDocEncoding[src_data[i]];
@@ -473,7 +473,7 @@ CFX_ByteString PDF_EncodeText(const FX_WCHAR* pString,
     len = FXSYS_wcslen(pString);
   }
   CFX_ByteString result;
-  if (pCharMap == NULL) {
+  if (!pCharMap) {
     FX_CHAR* dest_buf1 = result.GetBuffer(len);
     int i;
     for (i = 0; i < len; i++) {