fix Werror=nonnull in close_command_file #430
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add check if fp is not NULL because of: ``` [ 92s] In function 'close_command_file', [ 92s] inlined from 'close_command_file' at src/naemon/commands.c:171:5: [ 92s] src/naemon/commands.c:186:9: error: argument 1 null where non-null expected [-Werror=nonnull] [ 92s] 186 | fclose(command_file_fp); [ 92s] | ^~~~~~~~~~~~~~~~~~~~~~~ [ 92s] In file included from src/naemon/objects_host.h:8, [ 92s] from src/naemon/comments.h:9, [ 92s] from src/naemon/commands.c:3: [ 92s] /usr/include/stdio.h: In function 'close_command_file': [ 92s] /usr/include/stdio.h:183:12: note: in a call to function 'fclose' declared 'nonnull' [ 92s] 183 | extern int fclose (FILE *__stream) __nonnull ((1)); [ 92s] | ^~~~~~ [ 93s] cc1: all warnings being treated as errors ``` Signed-off-by: Sven Nierlein <[email protected]>
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add check if fp is not NULL because of: