refactor(scripts): clean up bash scripts

script/check-mallocs

@@ -1,20 +1,12 @@
 #!/usr/bin/env bash
 
-src_dir="lib/src"
+src_dir=lib/src
+allocation_functions=(malloc calloc realloc free)
 
-allocation_functions=(
-  malloc
-  calloc
-  realloc
-  free
-)
-
-for function in ${allocation_functions[@]}; do
-  usages=$(grep --line-number -E "\b${function}\(" -r "${src_dir}" --exclude alloc.h )
-
-  if [[ ! -z $usages ]]; then
-    echo "The ${function} function should not be called directly, but is called here:"
-    echo "$usages"
+for function in "${allocation_functions[@]}"; do
+  usages=$(grep -n -E "\b${function}\(" -r $src_dir --exclude alloc.c --exclude stdlib.c)
+  if [[ -n $usages ]]; then
+    printf 'The %s function should not be called directly, but is called here:\n%s\n' "$function" "$usages" >&2
     exit 1
   fi
 done