[PATCH] elf.c: initialize st_mode member

[mingli.yu]

From: Mingli Yu 

Initialize st_mode member to fix the below
build failure when -Og included in compiler flag.
| 
./../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c:
 In function 'elf_is_symlink':
| 
../../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c:772:21:
 error: 'st.st_mode' may be used uninitialized in this function 
[-Werror=maybe-uninitialized]
   return S_ISLNK (st.st_mode);

Signed-off-by: Mingli Yu 
---
 libbacktrace/elf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libbacktrace/elf.c b/libbacktrace/elf.c
index f4863f0..561bdc2 100644
--- a/libbacktrace/elf.c
+++ b/libbacktrace/elf.c
@@ -766,6 +766,7 @@ static int
 elf_is_symlink (const char *filename)
 {
   struct stat st;
+  st.st_mode = 0;
 
   if (lstat (filename, &st) < 0)
 return 0;
-- 
2.7.4

[PATCH v2] elf.c: initialize struct stat

[mingli.yu]

From: Mingli Yu 

Initialize struct stat to fix the below
build failure when -Og included in compiler flag.
| 
./../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c:
 In function 'elf_is_symlink':
| 
../../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c:772:21:
 error: 'st.st_mode' may be used uninitialized in this function 
[-Werror=maybe-uninitialized]
   return S_ISLNK (st.st_mode);

Signed-off-by: Mingli Yu 
---
 libbacktrace/elf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libbacktrace/elf.c b/libbacktrace/elf.c
index f3988ec..4ba8826 100644
--- a/libbacktrace/elf.c
+++ b/libbacktrace/elf.c
@@ -765,7 +765,7 @@ elf_syminfo (struct backtrace_state *state, uintptr_t addr,
 static int
 elf_is_symlink (const char *filename)
 {
-  struct stat st;
+  struct stat st = {0};
 
   if (lstat (filename, &st) < 0)
 return 0;
-- 
2.7.4