Revert "Remove FX_Alloc() null checks now that it can't return NULL."

core/src/fpdftext/fpdf_text_int.cpp

Index: core/src/fpdftext/fpdf_text_int.cpp
diff --git a/core/src/fpdftext/fpdf_text_int.cpp b/core/src/fpdftext/fpdf_text_int.cpp
index 69d0bc574f9b74fde506713d5ed70a38806a0b3d..882b22ceecd282e94d8d045ad0d5ab0bfb14f277 100644
--- a/core/src/fpdftext/fpdf_text_int.cpp
+++ b/core/src/fpdftext/fpdf_text_int.cpp
@@ -1164,6 +1164,9 @@ void CPDF_TextPage::AddCharInfoByLRDirection(CFX_WideString& str, int i)
             FX_STRSIZE nCount = FX_Unicode_GetNormalization(wChar, pDst);
             if (nCount >= 1) {
                 pDst = FX_Alloc(FX_WCHAR, nCount);
+                if (!pDst) {
+                    return;
+                }
                 FX_Unicode_GetNormalization(wChar, pDst);
                 for (int nIndex = 0; nIndex < nCount; nIndex++) {
                     PAGECHAR_INFO Info2 = Info;
@@ -1196,6 +1199,9 @@ void CPDF_TextPage::AddCharInfoByRLDirection(CFX_WideString& str, int i)
         FX_STRSIZE nCount = FX_Unicode_GetNormalization(wChar, pDst);
         if (nCount >= 1) {
             pDst = FX_Alloc(FX_WCHAR, nCount);
+            if (!pDst) {
+                return;
+            }
             FX_Unicode_GetNormalization(wChar, pDst);
             for (int nIndex = 0; nIndex < nCount; nIndex++) {
                 PAGECHAR_INFO Info2 = Info;