Revert "[sanitizer] Fix crash on empty strings."

Wrong author name, will recommit shortly.

This reverts commit 262c508.

Author: eugenis

compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cpp

@@ -356,7 +356,7 @@ void ParseSymbolizePCOutput(const char *str, SymbolizedStack *res) {
       InternalFree(info->function);
       info->function = 0;
     }
-    if (info->file && 0 == internal_strcmp(info->file, "??")) {
+    if (0 == internal_strcmp(info->file, "??")) {
       InternalFree(info->file);
       info->file = 0;
     }