[binutils-gdb] Remove fall throughs in core_target::xfer_partial.

[binutils-gdb] Remove fall throughs in core_target::xfer_partial.

[John Baldwin]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=0e30a3b0f233f828cc3274c2131ed31db275629c

commit 0e30a3b0f233f828cc3274c2131ed31db275629c
Author: John Baldwin <jhb@FreeBSD.org>
Date:   Thu Mar 17 09:37:24 2022 -0700

    Remove fall throughs in core_target::xfer_partial.
    
    The cases for TARGET_OBJECT_LIBRARIES and TARGET_OBJECT_LIBRARIES_AIX
    can try to fetch different data objects (such as
    TARGET_OBJECT_SIGNAL_INFO) if gdbarch methods for the requested data
    aren't present.  Return with TARGET_XFER_E_IO if the gdbarch method
    isn't present instead.

Diff:
---
 gdb/corelow.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gdb/corelow.c b/gdb/corelow.c
index 1579e6bc2b8..001c4f147fc 100644
--- a/gdb/corelow.c
+++ b/gdb/corelow.c
@@ -943,7 +943,7 @@ core_target::xfer_partial (enum target_object object, const char *annex,
 		return TARGET_XFER_OK;
 	    }
 	}
-      /* FALL THROUGH */
+      return TARGET_XFER_E_IO;
 
     case TARGET_OBJECT_LIBRARIES_AIX:
       if (m_core_gdbarch != nullptr
@@ -964,7 +964,7 @@ core_target::xfer_partial (enum target_object object, const char *annex,
 		return TARGET_XFER_OK;
 	    }
 	}
-      /* FALL THROUGH */
+      return TARGET_XFER_E_IO;
 
     case TARGET_OBJECT_SIGNAL_INFO:
       if (readbuf)