mu, tests: fix gcc-8.2.0 warnings
Without this commit gcc-8.2.0 whines
| CC mu-msg-json.lo
| mu-msg-json.c: In function ‘get_temp_file_maybe’:
| mu-msg-json.c:254:14: warning: unused variable ‘tmpfile’ [-Wunused-variable]
| char *tmp, *tmpfile;
| ^~~~~~~
| mu-msg-json.c:254:8: warning: unused variable ‘tmp’ [-Wunused-variable]
| char *tmp, *tmpfile;
| ^~~
| mu-msg-json.c: In function ‘add_part_crypto’:
| mu-msg-json.c:276:21: warning: unused variable ‘s’ [-Wunused-variable]
| char *signers, *s;
| ^
| mu-msg-json.c:276:11: warning: unused variable ‘signers’ [-Wunused-variable]
| char *signers, *s;
| ^~~~~~~
| mu-msg-json.c: In function ‘each_part’:
| mu-msg-json.c:332:14: warning: variable ‘cid’ set but not used [-Wunused-but-set-variable]
| const char *cid;
| ^~~
and
| CC test-mu-str.o
| test-mu-str.c: In function ‘test_mu_str_subject_normalize’:
| test-mu-str.c:282:5: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "test123", "test123" },
| ^~~~~~~~~
| test-mu-str.c:282:16: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "test123", "test123" },
| ^~~~~~~~~
| test-mu-str.c:283:5: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "Re:test123", "test123" },
| ^~~~~~~~~~~~
| test-mu-str.c:283:19: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "Re:test123", "test123" },
| ^~~~~~~~~
| test-mu-str.c:284:5: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "Re: Fwd: test123", "test123" },
| ^~~~~~~~~~~~~~~~~~
| test-mu-str.c:284:25: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "Re: Fwd: test123", "test123" },
| ^~~~~~~~~
| test-mu-str.c:285:5: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "Re[3]: Fwd: test123", "test123" },
| ^~~~~~~~~~~~~~~~~~~~~
| test-mu-str.c:285:28: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "Re[3]: Fwd: test123", "test123" },
| ^~~~~~~~~
| test-mu-str.c:286:5: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "operation: mindcrime", "operation: mindcrime" }, /*...*/
| ^~~~~~~~~~~~~~~~~~~~~~
| test-mu-str.c:286:29: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "operation: mindcrime", "operation: mindcrime" }, /*...*/
| ^~~~~~~~~~~~~~~~~~~~~~
| test-mu-str.c:287:5: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "", "" }
| ^~
| test-mu-str.c:287:9: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
| { "", "" }
| ^~
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