Get rid of trailing semicolons in C macro definitions.

Writing a trailing semicolon in a macro is almost never the right thing,
because you almost always want to write a semicolon after each macro
call instead.  (Even if there was some reason to prefer not to, pgindent
would probably make a hash of code formatted that way; so within PG the
rule should basically be "don't do it".)  Thus, if we have a semi inside
the macro, the compiler sees "something;;".  Much of the time the extra
empty statement is harmless, but it could lead to mysterious syntax
errors at call sites.  In perhaps an overabundance of neatnik-ism, let's
run around and get rid of the excess semicolons whereever possible.

The only thing worse than a mysterious syntax error is a mysterious
syntax error that only happens in the back branches; therefore,
backpatch these changes where relevant, which is most of them because
most of these mistakes are old.  (The lack of reported problems shows
that this is largely a hypothetical issue, but still, it could bite
us in some future patch.)

John Naylor and Tom Lane

Discussion: https://postgr.es/m/CACPNZCs0qWTqJ2QUSGJ07B7uvAvzMb-KbG2q+oo+J3tsWN5cqw@mail.gmail.com

src/backend/nodes/readfuncs.c

@@ -135,22 +135,22 @@
 /* Read an attribute number array */
 #define READ_ATTRNUMBER_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readAttrNumberCols(len);
+	local_node->fldname = readAttrNumberCols(len)
 
 /* Read an oid array */
 #define READ_OID_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readOidCols(len);
+	local_node->fldname = readOidCols(len)
 
 /* Read an int array */
 #define READ_INT_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readIntCols(len);
+	local_node->fldname = readIntCols(len)
 
 /* Read a bool array */
 #define READ_BOOL_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readBoolCols(len);
+	local_node->fldname = readBoolCols(len)
 
 /* Routine exit */
 #define READ_DONE() \

src/backend/utils/adt/formatting.c

@@ -422,7 +422,7 @@ typedef struct
 			(_X)->mode, (_X)->hh, (_X)->pm, (_X)->mi, (_X)->ss, (_X)->ssss, \
 			(_X)->d, (_X)->dd, (_X)->ddd, (_X)->mm, (_X)->ms, (_X)->year, \
 			(_X)->bc, (_X)->ww, (_X)->w, (_X)->cc, (_X)->j, (_X)->us, \
-			(_X)->yysz, (_X)->clock);
+			(_X)->yysz, (_X)->clock)
 #define DEBUG_TM(_X) \
 		elog(DEBUG_elog_output, "TM:\nsec %d\nyear %d\nmin %d\nwday %d\nhour %d\nyday %d\nmday %d\nnisdst %d\nmon %d\n",\
 			(_X)->tm_sec, (_X)->tm_year,\

src/backend/utils/sort/gen_qsort_tuple.pl

@@ -125,7 +125,7 @@ swapfunc(SortTuple *a, SortTuple *b, size_t n)
 		SortTuple t = *(a);				\
 		*(a) = *(b);					\
 		*(b) = t;						\
-	} while (0);
+	} while (0)
 
 #define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n)