Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/codecs/g722/test/testG722.cc

Index: webrtc/modules/audio_coding/codecs/g722/test/testG722.cc
diff --git a/webrtc/modules/audio_coding/codecs/g722/test/testG722.cc b/webrtc/modules/audio_coding/codecs/g722/test/testG722.cc
index c55a2eb3572175cde1df3d6527ad505049b20746..69a7d069cfaa72261b351221fb9bfa386c5c8543 100644
--- a/webrtc/modules/audio_coding/codecs/g722/test/testG722.cc
+++ b/webrtc/modules/audio_coding/codecs/g722/test/testG722.cc
@@ -89,17 +89,17 @@ int main(int argc, char* argv[])
     sscanf(argv[3], "%s", outbit);
     sscanf(argv[4], "%s", outname);
 
-    if ((inp = fopen(inname,"rb")) == NULL) {
-        printf("  G.722: Cannot read file %s.\n", inname);
-        exit(1);
+    if ((inp = fopen(inname, "rb")) == nullptr) {
+      printf("  G.722: Cannot read file %s.\n", inname);
+      exit(1);
     }
-    if ((outbitp = fopen(outbit,"wb")) == NULL) {
-        printf("  G.722: Cannot write file %s.\n", outbit);
-        exit(1);
+    if ((outbitp = fopen(outbit, "wb")) == nullptr) {
+      printf("  G.722: Cannot write file %s.\n", outbit);
+      exit(1);
     }
-    if ((outp = fopen(outname,"wb")) == NULL) {
-        printf("  G.722: Cannot write file %s.\n", outname);
-        exit(1);
+    if ((outp = fopen(outname, "wb")) == nullptr) {
+      printf("  G.722: Cannot write file %s.\n", outname);
+      exit(1);
     }
     printf("\nInput:%s\nOutput bitstream:%s\nOutput:%s\n", inname, outbit, outname);