[PATCH] Fix search of large memory area in gdbserver

[Hannes Domani <ssbssa@yahoo.de>]

If the search area is bigger than SEARCH_CHUNK_SIZE (16000), then you get
an error in gdbserver:
gdb: (gdb) find /w 0x3c43f0,+20000,0x04030201
gdb: Pattern not found.
gdbserver: Unable to access 3997 bytes of target memory at 0x3c8273, halting search.

The return value of any additional gdb_read_memory calls were compared with the
wrong value, this fixes it.

gdbserver/ChangeLog:

2020-04-22  Hannes Domani  <ssbssa@yahoo.de>

	* server.cc (handle_search_memory_1): Fix gdb_read_memory return value
	comparison.
---
 gdbserver/server.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdbserver/server.cc b/gdbserver/server.cc
index 77175ff74c..0672f9bc4d 100644
--- a/gdbserver/server.cc
+++ b/gdbserver/server.cc
@@ -1103,7 +1103,7 @@ handle_search_memory_1 (CORE_ADDR start_addr, CORE_ADDR search_space_len,
 			: chunk_size);
 
 	  if (gdb_read_memory (read_addr, search_buf + keep_len,
-			       nr_to_read) != search_buf_size)
+			       nr_to_read) != nr_to_read)
 	    {
 	      warning ("Unable to access %ld bytes of target memory "
 		       "at 0x%lx, halting search.",
-- 
2.26.1