media: staging: media: atomisp: remove pointless string copy

gcc-8 points out that a string is copied to itself here:

In file included from drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/platform_support.h:25,
                 from drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/memory_access/memory_access.h:48,
                 from drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c:16:
In function 'strncpy',
    inlined from 'ia_css_debug_pipe_graph_dump_stage' at drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/string_support.h:158:2:
include/linux/string.h:253:9: error: '__builtin_strncpy' source argument is the same as destination [-Werror=restrict]
  return __builtin_strncpy(p, q, size);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This removes the bogus code, leaving the behavior otherwise
unchanged.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c

@@ -2858,13 +2858,7 @@ ia_css_debug_pipe_graph_dump_stage(
 			if (l && enable_info[l-1] == ',')
 				enable_info[--l] = '\0';
 
-			if (l <= ENABLE_LINE_MAX_LENGTH) {
-				/* It fits on one line, copy string and init */
-				/* other helper strings with empty string */
-				strcpy_s(enable_info,
-					sizeof(enable_info),
-					ei);
-			} else {
+			if (l > ENABLE_LINE_MAX_LENGTH) {
 				/* Too big for one line, find last comma */
 				p = ENABLE_LINE_MAX_LENGTH;
 				while (ei[p] != ',')