Fix klocwork scanning issues in BootloaderCommonPkg

Fixed several issues reported by klockwork scanning.

Signed-off-by: Maurice Ma <maurice.ma@intel.com>

BootloaderCommonPkg/Library/MmcAccessLib/MmcAccessLib.c

@@ -229,9 +229,7 @@ SdCardSendOpCond (
     //
     // For details, refer to SD Host Controller Simplified Spec 3.0 Table 2-12.
     //
-    if  (Argument != NULL) {
-      *Argument = SdMmcStatusBlk.Resp0;
-    }
+    *Argument = SdMmcStatusBlk.Resp0;
   }
 
   return Status;

BootloaderCommonPkg/Library/MmcAccessLib/MmcAccessLibGeneric.c

@@ -1666,6 +1666,9 @@ MmcSelectPart (
   }
 
   Private = MmcGetHcPrivateData();
+  if (Private == NULL) {
+    return EFI_NOT_READY;
+  }
 
   Status = MmcGetExtCsd (Private);
   if (EFI_ERROR (Status)) {
@@ -1744,6 +1747,10 @@ MmcReadBlocks (
   }
 
   Private = MmcGetHcPrivateData();
+  if (Private == NULL) {
+    return EFI_NOT_READY;
+  }
+
   if (DeviceIndex != Private->CurrentPartition) {
     Status = MmcSelectPart ((UINT8)DeviceIndex);
     if (EFI_ERROR (Status)) {
@@ -1783,13 +1790,15 @@ MmcWriteBlocksExt (
   EFI_STATUS               Status;
   SD_MMC_HC_PRIVATE_DATA  *Private;
 
-  Private = NULL;
-
   if (!MmcIsInitialized()) {
     return EFI_NOT_READY;
   }
 
   Private = MmcGetHcPrivateData();
+  if (Private == NULL) {
+    return EFI_NOT_READY;
+  }
+
   if (DeviceIndex != Private->CurrentPartition) {
     Status = MmcSelectPart ((UINT8)DeviceIndex);
     if (EFI_ERROR (Status)) {
@@ -1866,6 +1875,9 @@ MmcGetMediaInfo (
   }
 
   Private = MmcGetHcPrivateData();
+  if (Private == NULL) {
+    return EFI_NOT_READY;
+  }
 
   if (DeviceIndex != Private->CurrentPartition) {
     Status = MmcSelectPart ((UINT8)DeviceIndex);

BootloaderCommonPkg/Library/UfsBlockIoLib/UfsBlockIoLib.c

@@ -1078,7 +1078,7 @@ UfsReadBlocks (
     ReadSize   += ReadBlockSize;
     LbaAddress += ReadBlockSize / SIZE_4KB;
   }
- 
+
   return Status;
 }
 
@@ -1320,11 +1320,6 @@ InitializeUfs (
       break;
     }
 
-    if (Private == NULL) {
-      Status = EFI_OUT_OF_RESOURCES;
-      break;
-    }
-
     CopyMem (Private, &gUfsHcTemplate, sizeof (UFS_PEIM_HC_PRIVATE_DATA));
 
     Private->UfsHcBase = MmioBase;