src/*.c: Add newline between function return type and its name

The purpose of this change is two-fold:
- make function and variable declarations grep-friendly (one can use a
  pattern /^fn_name/ to find the definition);
- make the lines shorter, so less functions need to have their arguments
  span over many lines.

This is more grep-friendly both for finding the function definition, but
also for matching on the return type of the function or the variable.

Update tests/c-lint.sh to enforce this.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/tar.h b/src/tar.h
index 2f02027..ce1b1fb 100644
--- a/src/tar.h
+++ b/src/tar.h
@@ -3,13 +3,15 @@
 
 #include <stdio.h>
 
-int tarball_write_from_directory(
-	FILE *const fd,
+int
+tarball_write_from_directory(
+	const FILE *const fd,
 	const char *const directory_path
 );
 
 #ifdef TEST
-void unit_tests_tar(void);
+void
+unit_tests_tar(void);
 #endif
 
 #endif