Adjust conditional expressions to resolve compiler warnings

backend/canon_pp-io.c

@@ -178,8 +178,8 @@ int sanei_canon_pp_wake_scanner(struct parport *port, int mode)
 			usleep(100000);
 		}
 
-	} while ((i < max_cycles) && (!expect(port,"Scanner wakeup reply 2",
-					0x03, 0x1f, 100000) == 0));
+	} while ((i < max_cycles) && expect(port, "Scanner wakeup reply 2",
+					0x03, 0x1f, 100000));
 
 	/* Block just after chessboarding
 	   Reply 1 (S3 and S4 on, S5 and S7 off) */

backend/microtek2.h

@@ -827,7 +827,7 @@ typedef struct Microtek2_Info {
     SANE_Byte nlens;
     SANE_Byte nwindows;
     SANE_Byte shtrnsferequ;
-#define MI_WHITE_SHADING_ONLY(x)       ((x) & 0x20) == 0
+#define MI_WHITE_SHADING_ONLY(x)       (((x) & 0x20) == 0)
 #define MI_HAS_SCNBTTN                 SANE_TRUE
     SANE_Bool scnbuttn;
 #define MI_HAS_PIPOBUF                 SANE_TRUE

backend/mustek_usb2_asic.c

@@ -3901,12 +3901,12 @@ Asic_SetWindow (PAsic chip, SANE_Byte bScanBits,
       BytePerPixel = 2;
       chip->dwBytesCountPerRow = (unsigned int) (wWidth) * 2;
     }
-  else if ((bScanBits == 8))
+  else if (bScanBits == 8)
     {
       BytePerPixel = 1;
       chip->dwBytesCountPerRow = (unsigned int) (wWidth);
     }
-  else if ((bScanBits < 8))
+  else if (bScanBits < 8)
     {
       BytePerPixel = 1;
       chip->dwBytesCountPerRow = (unsigned int) (wWidth);
@@ -4926,13 +4926,13 @@ Asic_SetCalibrate (PAsic chip, SANE_Byte bScanBits, unsigned short wXResolution,
       BytePerPixel = 2;
       chip->dwBytesCountPerRow = (unsigned int) (wWidth) * 2;
     }
-  else if ((bScanBits == 8))
+  else if (bScanBits == 8)
     {
       wPerLineNeedBufferSize = wWidth;
       BytePerPixel = 1;
       chip->dwBytesCountPerRow = (unsigned int) (wWidth);
     }
-  else if ((bScanBits < 8))
+  else if (bScanBits < 8)
     {
       wPerLineNeedBufferSize = wWidth >> 3;
       BytePerPixel = 1;

backend/stv680.c

@@ -1439,7 +1439,7 @@ stv680_bayer_unshuffle (Stv680_Vidcam * dev, SANE_Byte * buf, size_t * size)
 	   "stv680_bayer_unshuffle: if needed, trim to size 160 done\n");
     }
   /* reset to proper width */
-  if ((dev->subsample == 160))
+  if (dev->subsample == 160)
     {
       vw = 160;
       vh = 120;