__system_property_set: add string names for init's error codes.

https://issuetracker.google.com/336223505 is not the first
hard-to-read bug here.

Change-Id: I520aeb2cb87423f8db394bf4709d659e3eb3a309
diff --git a/libc/bionic/system_property_set.cpp b/libc/bionic/system_property_set.cpp
index 6e49bce..73cf151 100644
--- a/libc/bionic/system_property_set.cpp
+++ b/libc/bionic/system_property_set.cpp
@@ -257,6 +257,21 @@
   }
 }
 
+static const char* __prop_error_to_string(int error) {
+  switch (error) {
+  case PROP_ERROR_READ_CMD: return "PROP_ERROR_READ_CMD";
+  case PROP_ERROR_READ_DATA: return "PROP_ERROR_READ_DATA";
+  case PROP_ERROR_READ_ONLY_PROPERTY: return "PROP_ERROR_READ_ONLY_PROPERTY";
+  case PROP_ERROR_INVALID_NAME: return "PROP_ERROR_INVALID_NAME";
+  case PROP_ERROR_INVALID_VALUE: return "PROP_ERROR_INVALID_VALUE";
+  case PROP_ERROR_PERMISSION_DENIED: return "PROP_ERROR_PERMISSION_DENIED";
+  case PROP_ERROR_INVALID_CMD: return "PROP_ERROR_INVALID_CMD";
+  case PROP_ERROR_HANDLE_CONTROL_MESSAGE: return "PROP_ERROR_HANDLE_CONTROL_MESSAGE";
+  case PROP_ERROR_SET_FAILED: return "PROP_ERROR_SET_FAILED";
+  }
+  return "<unknown>";
+}
+
 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
 int __system_property_set(const char* key, const char* value) {
   if (key == nullptr) return -1;
@@ -310,8 +325,8 @@
 
     if (result != PROP_SUCCESS) {
       async_safe_format_log(ANDROID_LOG_WARN, "libc",
-                            "Unable to set property \"%s\" to \"%s\": error code: 0x%x", key, value,
-                            result);
+                            "Unable to set property \"%s\" to \"%s\": %s (0x%x)", key, value,
+                            __prop_error_to_string(result), result);
       return -1;
     }