Reformat Perl_assert() definition

This removes an extraneous paren pair, and changes the white space in
preparation for the next commit

Author: khwilliamson

perl.h

@@ -5098,10 +5098,11 @@ Gid_t getegid (void);
 
 #ifdef DEBUGGING
 #  define Perl_assert(what)                                                 \
-     ((what)                                                                \
-      ? ((void) 0)                                                          \
-      : (Perl_croak_nocontext("Assertion %s failed: file \"" __FILE__       \
-                        "\", line %d", STRINGIFY(what), __LINE__)
+        ((what)                                                             \
+         ? ((void) 0)                                                       \
+         : Perl_croak_nocontext("Assertion %s failed:"                      \
+                                " file \"" __FILE__ "\", line %d",          \
+                                STRINGIFY(what),  __LINE__))
 #else
 #  define Perl_assert(what)  ((void) 0)
 #endif