Zero-initialize two variables to fix a use-of-uninitialized-value warning

PiperOrigin-RevId: 975493921
Change-Id: Ia6d6594ec4734c1803f0496d0abff4e484779a6e

absl/debugging/symbolize_elf.inc

diff --git a/absl/debugging/symbolize_elf.inc b/absl/debugging/symbolize_elf.inc
index 06c5634..182d0fd 100644
--- a/absl/debugging/symbolize_elf.inc
+++ b/absl/debugging/symbolize_elf.inc
@@ -1104,8 +1104,8 @@
   LineReader reader(wrapped_maps_fd.get(), static_cast<char *>(tmp_buf),
                     tmp_buf_size);
   while (true) {
-    const char *cursor;
-    const char *eol;
+    const char *cursor = nullptr;
+    const char *eol = nullptr;
     if (!reader.ReadLine(&cursor, &eol)) {  // EOF or malformed line.
       break;
     }