contrib/plugins: fix imatch

We can't directly save the ephemeral imatch from argv as that memory
will get recycled.

Message-Id: <20240103173349.398526-40-alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

contrib/plugins/execlog.c

@@ -199,7 +199,7 @@ static void parse_insn_match(char *match)
     if (!imatches) {
         imatches = g_ptr_array_new();
     }
-    g_ptr_array_add(imatches, match);
+    g_ptr_array_add(imatches, g_strdup(match));
 }
 
 static void parse_vaddr_match(char *match)