selftests/mm: deduplicate second mmap() of 5*PAGE_SIZE at base

The map_fixed_noreplace test does two blocks of test starting from a
mapping of 5 pages at the base address, logging a test result for each
initial mapping.  These are logged with the same test name, causing test
automation software to see two reports for the same test in a single run. 
Tweak the log message for the second one to deduplicate.

Link: https://lkml.kernel.org/r/20250518-selftests-mm-map-fixed-noreplace-dup-v1-1-1a11a62c5e9f@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: broonie

tools/testing/selftests/mm/map_fixed_noreplace.c

@@ -96,7 +96,7 @@ int main(void)
 		ksft_exit_fail_msg("Error:1: mmap() succeeded when it shouldn't have\n");
 	}
 	ksft_print_msg("mmap() @ 0x%lx-0x%lx p=%p result=%m\n", addr, addr + size, p);
-	ksft_test_result_pass("mmap() 5*PAGE_SIZE at base\n");
+	ksft_test_result_pass("Second mmap() 5*PAGE_SIZE at base\n");
 
 	/*
 	 * Second mapping contained within first: