Fix duplicated fwarning warnings

This amends commit 11418a46c ("dns fixes", 2019-10-31).

fwarning already prints "Warning: " at the beginning.

Kind of relates to commit 6ddedeba0 ("Make nogroups work on nvidia
again", 2021-11-29) / PR #4725, which removed code affected by this.

Command used to find the duplicates:

    git grep -i -F 'fwarning("Warning:' -- src

2 files changed, 2 insertions, 2 deletions

diff --git a/src/firejail/main.c b/src/firejail/main.c
index 59e88bdc6..e8815d5cd 100644
--- a/src/firejail/main.c
+++ b/src/firejail/main.c
@@ -2642,7 +2642,7 @@ int main(int argc, char **argv, char **envp) {
                         else if (cfg.dns4 == NULL)
                                 cfg.dns4 = dns;
                         else {
-                                fwarning("Warning: up to 4 DNS servers can be specified, %s ignored\n", dns);
+                                fwarning("up to 4 DNS servers can be specified, %s ignored\n", dns);
                                 free(dns);
                         }
                 }
diff --git a/src/firejail/profile.c b/src/firejail/profile.c
index 756b370aa..5e24591fa 100644
--- a/src/firejail/profile.c
+++ b/src/firejail/profile.c
@@ -1106,7 +1106,7 @@ int profile_check_line(char *ptr, int lineno, const char *fname) {
                 else if (cfg.dns4 == NULL)
                         cfg.dns4 = dns;
                 else {
-                        fwarning("Warning: up to 4 DNS servers can be specified, %s ignored\n", dns);
+                        fwarning("up to 4 DNS servers can be specified, %s ignored\n", dns);
                         free(dns);
                 }
                 return 0;