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

core/src/fpdfapi/fpdf_font/ttgsubtable.cpp

Index: core/src/fpdfapi/fpdf_font/ttgsubtable.cpp
diff --git a/core/src/fpdfapi/fpdf_font/ttgsubtable.cpp b/core/src/fpdfapi/fpdf_font/ttgsubtable.cpp
index 4786b8be94fd8e9d5376c39e3feafe7e98622a6e..035ea8a0ff85f016c083fa107cb3975c4b46ac65 100644
--- a/core/src/fpdfapi/fpdf_font/ttgsubtable.cpp
+++ b/core/src/fpdfapi/fpdf_font/ttgsubtable.cpp
@@ -47,7 +47,7 @@ FX_BOOL CFX_GlyphMap::Lookup(int key, int& value) {
   void* pResult = FXSYS_bsearch(&key, m_Buffer.GetBuffer(),
                                 m_Buffer.GetSize() / sizeof(_IntPair),
                                 sizeof(_IntPair), _CompareInt);
-  if (pResult == NULL) {
+  if (!pResult) {
     return FALSE;
   }
   value = ((FX_DWORD*)pResult)[1];
@@ -158,7 +158,7 @@ bool CFX_CTTGSUBTable::GetVerticalGlyphSub2(uint32_t glyphnum,
 int CFX_CTTGSUBTable::GetCoverageIndex(struct TCoverageFormatBase* Coverage,
                                        uint32_t g) {
   int i = 0;
-  if (Coverage == NULL) {
+  if (!Coverage) {
     return -1;
   }
   switch (Coverage->CoverageFormat) {