Revert "Remove FX_Alloc() null checks now that it can't return 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 691981cb10b5a96627513e69c912f98ac9d8ea24..8f5871df7f11f19788719eb73e2acad5cbd03dda 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
@@ -40,6 +40,9 @@ FX_DWORD _A85Decode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& dest_b
         return (FX_DWORD) - 1;
     }
     dest_buf = FX_Alloc(FX_BYTE, zcount * 4 + (pos - zcount));
+    if (dest_buf == NULL) {
+        return (FX_DWORD) - 1;
+    }
     int state = 0;
     FX_UINT32 res = 0;
     pos = dest_size = 0;
@@ -150,6 +153,9 @@ FX_DWORD RunLengthDecode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& d
         return -1;
     }
     dest_buf = FX_Alloc( FX_BYTE, dest_size);
+    if (!dest_buf) {
+        return -1;
+    }
     i = 0;
     int dest_count = 0;
     while (i < src_size) {