Cleanup: Blenlib, Clang-Tidy else-after-return fixes (incomplete)

This addresses warnings from Clang-Tidy's `readability-else-after-return`
rule in the `source/blender/blenlib` module. Not all warnings are
addressed in this commit.

No functional changes.

source/blender/blenlib/intern/string_utils.c

@@ -72,7 +72,7 @@ size_t BLI_split_name_num(char *left, int *nr, const char *name, const char deli
         }
         return a;
       }
-      else if (isdigit(name[a]) == 0) {
+      if (isdigit(name[a]) == 0) {
         /* non-numeric suffix - give up */
         break;
       }