[flang] [llvm] [flang][NFC] Restore I/O runtime API header name (PR #132423)

[Eugene Epshteyn via llvm-commits]

================
@@ -79,6 +79,23 @@ bool IoStatementBase::Inquire(InquiryKeywordHash, std::int64_t &) {
   return false;
 }
 
+RT_API_ATTRS static const char *InquiryKeywordHashDecode(
+    char *buffer, std::size_t n, InquiryKeywordHash hash) {
+  if (n < 1) {
+    return nullptr;
+  }
+  char *p{buffer + n};
+  *--p = '\0';
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eugeneepshteyn wrote:

Not related to this particular PR, but if `n` happens to be 0, this line will overwrite something right before the buffer.

https://github.com/llvm/llvm-project/pull/132423