fix bit shift errors when compliing on arm - take 2

pocsagencode.go

@@ -124,9 +124,9 @@ func appendContentText(content string) (int, Burst) {
 	out := make(Burst, 0)
 	debugf("appendContentText: %s", content)
 
-	bitpos := uint32(0)
+	bitpos := 0
 	word := uint32(0)
-	leftbits := uint32(0)
+	leftbits := 0
 	pos := 0
 
 	// walk through characters in message
@@ -146,7 +146,7 @@ func appendContentText(content string) (int, Burst) {
 			debugf("  bits of char won't fit since bitpos is %d, got %d bits free, leaving %d bits in next word", bitpos, space, leftbits)
 		}
 
-		word |= (uint32(char)<<31 - 7 - bitpos)
+		word |= (uint32(char) << uint(31-7-bitpos))
 
 		bitpos += 7
 
@@ -159,7 +159,7 @@ func appendContentText(content string) (int, Burst) {
 		}
 
 		if leftbits > 0 {
-			word |= (uint32(char) << int(31-leftbits))
+			word |= (uint32(char) << uint(31-leftbits))
 			bitpos = leftbits
 			leftbits = 0
 		}
@@ -170,7 +170,7 @@ func appendContentText(content string) (int, Burst) {
 		step := 0
 		for bitpos < 20 {
 			if step == 2 {
-				word |= (1 << int(30-bitpos))
+				word |= (1 << uint(30-bitpos))
 			}
 			bitpos++
 			step++