Adjust blank lines around PG_MODULE_MAGIC defines, for consistency

Report by Robert Haas

src/backend/snowball/dict_snowball.c

@@ -58,7 +58,6 @@
 #include "snowball/libstemmer/stem_UTF_8_swedish.h"
 #include "snowball/libstemmer/stem_UTF_8_turkish.h"
 
-
 PG_MODULE_MAGIC;
 
 PG_FUNCTION_INFO_V1(dsnowball_init);

src/pl/plperl/plperl.c

@@ -60,7 +60,6 @@ EXTERN_C void boot_PostgreSQL__InServer__SPI(pTHX_ CV *cv);
 
 PG_MODULE_MAGIC;
 
-
 /**********************************************************************
  * Information associated with a Perl interpreter.  We have one interpreter
  * that is used for all plperlu (untrusted) functions.  For plperl (trusted)

src/tutorial/complex.c

@@ -12,7 +12,6 @@
 #include "fmgr.h"
 #include "libpq/pqformat.h"		/* needed for send/recv functions */
 
-
 PG_MODULE_MAGIC;
 
 typedef struct Complex

src/tutorial/funcs.c

@@ -18,7 +18,6 @@
 
 PG_MODULE_MAGIC;
 
-
 /* These prototypes just prevent possible warnings from gcc. */
 
 int			add_one(int arg);

src/tutorial/funcs_new.c

@@ -16,7 +16,6 @@
 #include "executor/executor.h"	/* for GetAttributeByName() */
 #include "utils/geo_decls.h"	/* for point type */
 
-
 PG_MODULE_MAGIC;
 
 /* These prototypes just prevent possible warnings from gcc. */