Replace NULL with nullptr

(cherry picked from commit 851135bf9941b3813adb9b4f43d76e040c4ba157)

Change-Id: Ic4997907680db7472ef38ffb0f0ca66fff37b797
diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
index 611f1a7..50708a0 100644
--- a/linker/linker_phdr.h
+++ b/linker/linker_phdr.h
@@ -81,7 +81,7 @@
 };
 
 size_t phdr_table_get_load_size(const ElfW(Phdr)* phdr_table, size_t phdr_count,
-                                ElfW(Addr)* min_vaddr = NULL, ElfW(Addr)* max_vaddr = NULL);
+                                ElfW(Addr)* min_vaddr = nullptr, ElfW(Addr)* max_vaddr = nullptr);
 
 int phdr_table_protect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias);