correct mask for finding field in linkGrp

It worked before because the get_xxx functions are never called for
the links (bit0 = 1), but checking both bits looks cleaner.

modules/database/src/std/rec/seqRecord.c

@@ -285,7 +285,7 @@ static long get_units(DBADDR *paddr, char *units)
     int fieldOffset = dbGetFieldIndex(paddr) - indexof(DLY0);
 
     if (fieldOffset >= 0)
-        switch (fieldOffset & 2) {
+        switch (fieldOffset & 3) {
         case 0: /* DLYn */
             strcpy(units, "s");
             break;
@@ -303,7 +303,7 @@ static long get_precision(const DBADDR *paddr, long *pprecision)
     short precision;
 
     if (fieldOffset >= 0)
-        switch (fieldOffset & 2) {
+        switch (fieldOffset & 3) {
         case 0: /* DLYn */
             *pprecision = seqDLYprecision;
             return 0;
@@ -324,7 +324,7 @@ static long get_graphic_double(DBADDR *paddr, struct dbr_grDouble *pgd)
     int fieldOffset = dbGetFieldIndex(paddr) - indexof(DLY0);
 
     if (fieldOffset >= 0)
-        switch (fieldOffset & 2) {
+        switch (fieldOffset & 3) {
         case 0: /* DLYn */
             pgd->lower_disp_limit = 0.0;
             pgd->lower_disp_limit = 10.0;
@@ -343,7 +343,7 @@ static long get_control_double(DBADDR *paddr, struct dbr_ctrlDouble *pcd)
 {
     int fieldOffset = dbGetFieldIndex(paddr) - indexof(DLY0);
 
-    if (fieldOffset >= 0 && (fieldOffset & 2) == 0) { /* DLYn */
+    if (fieldOffset >= 0 && (fieldOffset & 3) == 0) { /* DLYn */
         pcd->lower_ctrl_limit = 0.0;
         pcd->upper_ctrl_limit = seqDLYlimit;
     }
@@ -357,7 +357,7 @@ static long get_alarm_double(DBADDR *paddr, struct dbr_alDouble *pad)
     seqRecord *prec = (seqRecord *) paddr->precord;
     int fieldOffset = dbGetFieldIndex(paddr) - indexof(DLY0);
 
-    if (fieldOffset >= 0 && (fieldOffset & 2) == 2)  /* DOn */
+    if (fieldOffset >= 0 && (fieldOffset & 3) == 2)  /* DOn */
         dbGetAlarmLimits(get_dol(prec, fieldOffset),
             &pad->lower_alarm_limit,   &pad->lower_warning_limit,
             &pad->upper_warning_limit, &pad->upper_alarm_limit);