Merge pull request #776 from marxin/fix-2-warnings

fix 2 -Wextra warnings

Author: rui314

elf/mold-wrapper.c

@@ -22,7 +22,7 @@ static char *get_mold_path() {
   exit(1);
 }
 
-static void debug_print(char *fmt, ...) {
+static void debug_print(const char *fmt, ...) {
   if (!getenv("MOLD_WRAPPER_DEBUG"))
     return;
 

macho/mold.h

@@ -233,7 +233,7 @@ class Subsection {
   u32 nrels = 0;
   u32 unwind_offset = 0;
   u32 nunwind = 0;
-  Subsection<E> *replacer; // Used if is_coalesced is true
+  Subsection<E> *replacer = nullptr; // Used if is_coalesced is true
 
   std::atomic_uint8_t p2align = 0;
   std::atomic_bool is_alive = true;