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, 4 insertions, 2 deletions

diff --git a/src/lib.h b/src/lib.h
index 50ff2f2..07e900b 100644
--- a/src/lib.h
+++ b/src/lib.h
@@ -1,10 +1,12 @@
 #ifndef GISTATIC_GISTATIC_H
 #define GISTATIC_GISTATIC_H
 
-int gistatic_main(const int argc, char *const argv[]);
+int
+gistatic_main(const int argc, char *const argv[]);
 
 #ifdef TEST
-void unit_tests_gistatic(void);
+void
+unit_tests_gistatic(void);
 #endif
 
 #endif